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C10 / K10 Squarebody LS swap
A typical C10 / K10 Squarebody LS swap runs about $7,000–$12,000 in parts ($3,500 on a budget), and the big decision is where the engine sits: kits put the engine up to 3 in apart, which changes oil pan and A/C clearance.
Last updated
Chevrolet/GMC · 1973–1987Swap kits verifiedC/K 3rd gen2 parts lists
1973–1987 Chevy/GMC C10 (2WD half-ton trucks/SUVs) LS swap — moderate
1973–1987 Chevy/GMC C10 (2WD half-ton trucks/SUVs) LS swap. The 5.3 Vortec (e.g., LM7) is the default pick; a 6.0 for low-end torque; a 6.2 L92/L9H/L94 for more NA power.
Recommended engine: 5.3 LM7 (default); 6.0 / 6.2 options — compare LS engines & donors
Watch out for: V6 frame stands do NOT work with LS mount adapters; V8 stands required. Don't reuse the original driveshaft; target driveline angles ~2° down at the trans and ~2° up at the pinion. Most stock LS truck pans clear the crossmember but hang several inches below it; use the LH8/"Muscle Car" pan (~0.5 in below) or a Holley 302-1 or 302-2 pan (shallower). Forward mount position requires notching the front crossmember for pan clearance. Vortec truck accessory drives don't fit with the AC compressor; F-body drives fit. Mechanical fan needs a Gen III Vortec water pump, shroud and fan clutch. Stock ECM is recommended unless very high power, but it needs a tune (VATS delete, DTCs); Gen IV engines need a drive-by-wire pedal mount. All LS engines need 58–60 psi constant fuel pressure.
1973–1987 Chevy K10 (4WD, leaf-spring solid front axle) LS swap — moderate
1973–1987 Chevy K10 (4WD, leaf-spring solid front axle) LS swap. Keeping the original/period transmission (TH350/TH400/700R4) and transfer case keeps the swap simpler.
Recommended engine: LM7 5.3 (with the OEM LM7 Vortec harness) — compare LS engines & donors
Watch out for: Pre-1988 trucks (pre-1992 SUVs) must reuse the original transfer case (front driveshaft exits passenger side). Adapting a 4LXX to the old transfer case costs ~$750–900 in kits and needs the tailshaft/housing removed. Old GM trans to LS needs an adapter flexplate plus a crank torque-converter sleeve. Vortec LS pans clear the frame but hit the front axle on 4WD; use a low-profile pan. Stock LS truck manifolds fit K10; stock car manifolds don't (Hooker cast manifolds fit). Low-mount AC compressor on the Vortec truck drive hits the frame rails; delete AC or use a top-mount AC bracket. Stock fuel pump won't work (mechanical pre-1987). Crank reluctor: 24x (black sensor) 1997–2006, 58x (gray sensor) 2006+; ECM/harness must match. Factory V8 radiator is fine with a steam-port hose adapter.
Parts and steps for the C10 / K10 Squarebody
Every part option we know for each stage of the swap, plus 168 sourced facts and 274 owner questions. Open a step, start with our pick, and check all the options. Plan your exact combination →
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Before you buy
- Mounts, crossmember & oil pan Well sourced
Decide where the engine sits (kit mounts or custom), then measure from the pan rail to the crossmember and to the ground before you choose an oil pan. - Transmission & driveline Well sourced
Decide which transmission handles your torque and how it will be controlled, then plan the crossmember, driveshaft length and flexplate or bellhousing to match. - Accessories & cooling Well sourced
Decide one accessory drive spacing, and match the balancer, water pump and brackets to it. Then check fan, hose and hood clearance. - Fuel system Well sourced
Decide return or returnless, and a pump and injectors sized for your power and fuel (gas or E85). - Wiring, computer & tune Well sourced
Decide a harness and computer that match your engine's crank signal (24x or 58x) and throttle (cable or drive-by-wire), and plan the tune, including VATS.
Biggest gap: cost. Owners ask about it a lot (6 questions), but we have few sourced facts for this vehicle yet.
Parts we know for this vehicle: 148 options across 10 of 10 categories.
What it costs: budget build about $3,500; typical build $7,000–$12,000 (parts, not labor, prices as of 2026-10-01).
5.3/6.0, BRP conversion kit ($529), Holley Terminator X, BRP EFI tank kit ($599), aluminum radiator w/ fans (~$1,469), BRP long-tube headers ($899), swap crossmember, hydroboost, A/C compressor bracket, dyno tune (~$500).
Required parts priced so far, one total per version (they're alternatives, not added together):
- 1973–1987 Chevy/GMC C10 (2WD half-ton trucks/SUVs): $647.78
- 1973–1987 Chevy K10 (4WD, leaf-spring solid front axle): $2,000.54
(required parts on this parts list that have a listed price; parts only: engine, transmission, wiring and labor are extra. Build the full budget →)
Tags: Verified on our parts list or confirmed on the maker's page for this vehicle · Listed the vendor's catalog names this vehicle · Community from owners' builds and small sellers.
Parts and notes for one drivetrain only are labelled 2WD or 4WD; the switch in the step bar hides the other one.
Beta We're still fixing fitment as owners report it. Double-check parts before you buy. See what's new →
1Engine choicePick the engine, then confirm exactly which one it is
DecideWhich engine fits your power goal and budget.
CheckConfirm the exact engine by its RPO or the 8th VIN digit before you pay.
More notes for step 1Apply to the whole step, not one part
Kit-specific notes2 notes
- The 12621HKR is a 1.25-in-forward, 0.5-in-up adapter plate design for GM LS engines in 73-87 2WD trucks. 2WD
- ICT Billet's 551675 steam crossover fits all GM LS engines; the passenger adapter has two 1/8-inch NPT ports and the driver adapter has one.
Why this step matters: 5 of 274 owner questions about this vehicle
- How do you check piston-to-valve clearance?
- What should I inspect or service on a junkyard LS engine before installing it?
- 8.1 Vortec vs 383 stroker vs 6.0 iron LS for my square body - which should I pick?
- Is a big choppy cam like the TSP BFD 'chop monster' a good choice for a heavy truck?
- Is a carbureted 5.3 swap with a 700R4 a good idea?
More: Engine & donor finder · Making power
Ready for the next step when you know which engine you're using and have confirmed it by its RPO or VIN.
Next: mounts, crossmember & oil pan →2Mounts, crossmember & oil panSet where the engine sits, then pick a pan that clears · 4 parts
DecideWhere the engine sits (kit mounts or custom).
BuyICT Billet LS Swap Engine Mount Kit, 73-87 GM Truck $260BuyMounts & swap kits · alternatives in 2A
CheckMeasure from the pan rail to the crossmember and to the ground before you choose an oil pan.
Must know
- V6 frame stands do NOT work with LS mount adapters; V8 stands required.
- Vortec LS pans clear the frame but hit the front axle on 4WD; use a low-profile pan. 4WD
- 2WD and 4WD 1973-1987 C10 clamshell mounts do not interchange.
Mounts & swap kits
24 options · $58.74–$2,295Why you need it: The mounts set where the engine sits, and that decides oil pan, header and driveline fit. Kits put the engine up to 3 in apart: Tejas plates sit it forward and high and keep the truck pan and low-mount A/C; ICT's furthest-back position changes pan and A/C clearance. Hooker headers and the 12646HKR crossmember are drawn for the Hooker 12621HKR brackets. More: engine mounts and swap kits.
Our pick and alternativespick + 2 of 24
Our pick · 2WD & 4WDICT Billet LS Swap Engine Mount Kit, 73-87 GM Truck5510-KIT003EM · 1973-1987 Chevrolet C10, C20, C30, K10, K20, and K30, 2WD and 4WD. Blazer K1500 4WD is listed for 1973-1986. Retains the factory small-block crank and bellhousing position.
$260 (2026-09-28)Buy
Holley/Hooker LS swap engine mounts (front or rear bias)BlackHeart dual-position · Forward position for 6L80/90
Direct from Holley/Hooker
Hooker C10 LS Swap Engine Mount Brackets12621HKR · engine mount; 1973-1987. Clamshell-style engine mount brackets; 4WD fitment not stated
price not listedBuy
Compare 24 mount & swap kit options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| ICT Billet LS Swap Engine Mount Kit, 73-87 GM Truck Verified Our pick | 5510-KIT003EM | $260 2026-09-28 | 1973-1987 Chevrolet C10, C20, C30, K10, K20, and K30, 2WD and 4WD. Blazer K1500 4WD is listed for 1973-1986. Retains the factory small-block crank and bellhousing position. | Buy | |
| Holley/Hooker LS swap engine mounts (front or rear bias) Verified | BlackHeart dual-position | Forward position for 6L80/90 | Direct from Holley/Hooker | ||
| Hooker C10 LS Swap Engine Mount Brackets Verified | 12621HKR | price not listed 2026-09-30 | engine mount; 1973-1987. Clamshell-style engine mount brackets; 4WD fitment not stated | Buy | |
| Kwik Performance LS Wide Mount HD AC Bracket Truck 99-13 Camaro 10-15 Verified | K10472 | price not listed 2026-09-30 | A/C bracket; not stated. Wide-mount A/C relocation bracket for truck 99-13 and Camaro 10-15 long spacing; mounts Sanden 709 SD7; solves low-mount interference in classic trucks and muscle cars; works with factory GM alt/PS bracket Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| Kwik Performance LS High and Tight AC Bracket Truck 99-13 Camaro 10-15 Verified | K10780 | price not listed 2026-09-30 | A/C bracket; not stated. Engineered for truck/SUV 99-13 4.8/5.3/6.0/6.2 and Camaro 10-15 crank pulley spacing; explicitly clears factory hood on C10 and OBS trucks; uses Sanden SD7B10 7176 mini compressor; 6061-T6 satin aluminum; belt sold separately for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| Hooker Blackheart Premium Engine Mount Brackets C10 C20 Verified 2WD | BHS540 | price not listed 2026-09-30 | engine mount; 1973-87; 2WD. Redesigned brackets for LS or Gen-V LT in 73-87 C10/C20 2WD truck and 73-82 Blazer/Jimmy 2WD; replaces original frame stands; welded steel black powder coat; modular clamshells for 2WD only | Buy | |
| Dirty Dingo LS Conversion Mount 4WD 73-87 K10 Verified 4WD | DD-2585-4 | $119.99 2026-09-30 | engine mount; 1973-1987; 4WD; transmissions: TH350; TH400; TH700R4; 4L60E; 4L65E; 4L80. Adjustable.250 in steel conversion mounts; use factory clamshell mounts; engine moves up to 2.5 in forward for 4WD only | Buy | |
| Dirty Dingo LS Swap Low Mount A/C Bracket SD7B10 Verified | DD-LS-AC-LM | $149.99 2026-09-30 | A/C bracket; not stated. Passenger low mount for Sanden SD7B10 mini; fits all 97-2015 Gen III/IV LS; LS Truck Camaro/GTO Corvette spacing; belt not included Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Dirty Dingo | |
| Alan Grove Components LS Engine Low A/C Compressor Bracket Fullsize Truck Verified | 142R | $224.97 2026-09-30 | A/C bracket; not stated. Low mount passenger side steel bracket for Sanden 508 on GM LS series fullsize truck engines; TIG welded steel; incl tensioner hardware illustrated instructions Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Buy | |
| Dirty Dingo LS Sanden 508 A/C Bracket Assembly Camaro Spacing Verified | DD-LS-SANDEN-AC-CM | $274.99 2026-09-30 | A/C bracket; not stated. Billet 1/2 in 6061-T6 bracket for Sanden SD7H15 4711 4665 6669; 98-02 Camaro Firebird GTO spacing; incl Gates idler and Monster tensioner; compressor and belt not incl This page is the Camaro/Firebird bracket, not a C10 truck bracket. Camaro spacing, confirm for this truck Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Dirty Dingo | |
| Dirty Dingo LS 73-87 C10 2WD Combo Mount-Trans Kit Verified | LS-C10-2WD-CLAM-COMBO-K | $291.99 2026-09-30 | engine mount; 1973-1987; 2WD; transmissions: Powerglide; TH350; TH400; 700R4; 4L60; 4L65; 4L70; 4L75; 4L80; 6L80; 6L90. Includes DD-2500C mounts; replacement clamshells; DD-C10-TRANS crossmember; not for Dart aftermarket blocks for 2WD only | Direct from Dirty Dingo | |
| ICT Billet LS Truck Low Mount A/C Bracket Kit Sanden 7176 Verified | 551137-LS74-3 | $350.00 2026-09-30 | A/C bracket; not stated. Sanden 7176 SD7 low mount truck spacing; 4-rib; incl bracket hardware belt tensioner; free shipping over 100; sale 350 reg 410 Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| Dirty Dingo Sanden SD7B10 LS Low Mount AC Combo Kit Verified | DD-LS-SD7B10-LM-KIT | $468.99 2026-09-30 | A/C bracket; not stated. Bracket kit incl new Sanden-style 7176 SD7B10 100cc compressor and billet Tube-O adapter fittings; fits all 97-2015 Gen III/IV LS; belt not included; oversized shipping Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Dirty Dingo | |
| Holley Low LS Accessory Drive A/C Kit RH w/ SD7 Compressor Verified | 20-160 | $899.95 2026-09-30 | A/C bracket; not stated. Low-mount A/C bracket hardware spacers plus Sanden SD7 compressor; passenger side; fits standard middle long accessory spacing; works on LSA; bracket category Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Buy | |
| Pro Performance LS Swap Kit 73-87 C10 Verified 2WD | PP-7387-LS-Swap-Kit | $2,295.00 2026-09-30 | engine mount; 1973-1987; 2WD. Kit: Dirty Dingo slider engine mounts; Prothane poly mounts; Speed Eng mid-length headers; Speed Eng oil pan; React trans crossmember; Wizard 21 in radiator shroud SPAL fans for 2WD only | Check price & fitment | |
| PerTronix Doug's Headers SK101 Motor Mount Adapter Plate Kit for LS1/LS6 GM engines into 73-87 C10 Chevy Trucks Listed | SK101 | $167.41 2026-09-29 | for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | In stock |
| ICT Billet 1973-1987 Chevy Square Body Truck - LT Swap Engine Mount Kit for 2WD 4WD Listed | 5510-KIT553EM | $280 2026-09-29 | Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | In stock |
| Tejas SteelWorks LS motor mount adapter plates (73-87) Listed 2WD | — | 1973-1987 C10/C20 2WD (1/2-1 ton); retains LS truck oil pan and low-mount A/C for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Tejas SteelWorks | Small batch | |
| Dirty Dingo LS slider/adapter mount brackets Listed | — | 1973-1987 C10 LS swaps for 2WD only | Direct from Dirty Dingo | In production | |
| Hooker Blackheart LS swap engine mounting brackets Listed 2WD | 79-020 | 1973-1987 C10/15 2WD, 1979-1987 C20 2WD, 1973-1982 Blazer/Jimmy 2WD for 2WD only | Holley / Classic Parts of America | In production | |
| GM (junkyard) OE SBC clamshell mounts + covers, reused with adapter plates Listed | — | 1973-1987 trucks with adapter plates Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | junkyard / donor truck | Used only | |
| Hooker BlackHeart LS swap engine mounts, 4WD Listed 4WD | BHS555 | 1973-1987 4WD K10 and K5. The front crossmember may need notching depending on the oil pan. Transmission position is set by the transmission crossmember. for 4WD only | Buy | In production | |
| ICT Billet LS motor mount adapter plates Listed | 551628 | $58.74 2026-10-01 | 1963-1987 C10 (furthest-back plate position) for 2WD only | Buy | In production |
| BRP Hot Rods 1973-1987 2WD Truck LS Engine Mounts and Frame Bracket Kit Listed 2WD | — | $299.00 2026-10-01 | 1973-1987 2WD GM trucks for 2WD only | Check price & fitment | In production |
Oil pan
11 options · $299–$599.95Why you need it: The pan has to clear the crossmember, the ground and, on a 4x4, the front differential. On a 1973-87 truck the Muscle Car pan hangs about 0.5 in below the crossmember (the Holley 302 is shallower), and on a K10 the Vortec pan hits the front axle, so run a low-profile pan. More: oil pan guide.
Our pick and alternativespick + 2 of 11
Our pickChevrolet Performance LS Swap Muscle Car Oil Pan (LH8-style), LS1/LS319212593 · Hangs ~0.5 in below the crossmember
$312.79 (2026-09-28)Buy
Speedway Motors LS Swap Conversion Low Profile Oil Pan, OEM filter location 4WD4WD front-axle clearance · for 4WD only
$324.99Direct from Speedway Motors
Holley GM LS Swap Oil Pan 4WD Truck Off-Road Natural 4WD302-4 · oil pan; 1973-1987; 4WD. Fits 1973-87 GM K10 LS swapped trucks; cast aluminum; optional baffle 302-33 and rock shield 302-35; MSRP 506.95 · for 4WD only
$449.95Buy
Compare 11 oil pan options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Chevrolet Performance LS Swap Muscle Car Oil Pan (LH8-style), LS1/LS3 Verified Our pick | 19212593 | $312.79 2026-09-28 | Hangs ~0.5 in below the crossmember | Buy | |
| Speedway Motors LS Swap Conversion Low Profile Oil Pan, OEM filter location Verified 4WD | — | $324.99 2026-09-28 | 4WD front-axle clearance for 4WD only | Direct from Speedway Motors | |
| Holley GM LS Swap Oil Pan 4WD Truck Off-Road Natural Verified 4WD | 302-4 | $449.95 2026-09-30 | oil pan; 1973-1987; 4WD. Fits 1973-87 GM K10 LS swapped trucks; cast aluminum; optional baffle 302-33 and rock shield 302-35; MSRP 506.95 for 4WD only | Buy | |
| Holley GM LS Swap Oil Pan Most Front Clearance No Drain-Back Holes Verified | 302-5 | $474.95 2026-09-30 | oil pan; 1973-1987. Fits LS swapped GM classic car/trucks; most front clearance; MSRP 534.95; drive not stated | Buy | |
| Holley GM LS Swap Oil Pan 4WD Truck Off-Road Black Verified 4WD | 302-4BK | $499.95 2026-09-30 | oil pan; 1973-1987; 4WD. Fits 1973-87 GM K10 LS swapped trucks; includes sump baffle; pickup; filter stud; MSRP 562.95 for 4WD only | Buy | |
| Holley LS Swap Oil Pan 1955-87 GM Car/Truck 5.9 QT Rear Sump Natural Verified | 302-3 | $499.95 2026-09-30 | oil pan; 1973-1987. Rear sump 5.9 qt; 4 in crank clearance; incl sump baffle; pickup; filter stud; MSRP 562.95; drive not stated | Buy | |
| Holley LS Swap Oil Pan 1955-87 GM Car/Truck 5.5 QT Rear Sump Natural Verified | 302-1 | $499.95 2026-09-30 | oil pan; 1973-1987. Rear sump 5.5 qt; 5.89 in deep; sump 7.65 x 9.75 in; MSRP 562.95; drive not stated | Buy | |
| Holley LS Swap Oil Pan 1955-87 GM Car/Truck 6 QT Rear Sump Front Clearance Verified | 302-2 | $499.95 2026-09-30 | oil pan; 1973-1987. Front clearance pan; 6 qt; not for LS7/stroker; fits anywhere F-body pan used; MSRP 562.95; drive not stated | Buy | |
| Holley GM LT Swap Oil Pan 4WD Truck Off-Road Black Verified 4WD | 302-24BK | $599.95 2026-09-30 | oil pan; 1973-1987; 4WD. Fits 1973-87 GM K10 LT swapped trucks and other 4WD LT swap projects; MSRP 674.95 for 4WD only | Buy | |
| GM (donor) Stock LS truck oil pan (retained) Community | 12579273 | Tejas ~3in-forward mount position; pan ends up near flush with crossmember underside. GM 12579273 is the 1999-2007 4.8/5.3/6.0 truck, van, and SUV pan. Dorman 264-135 crosses to this number. That catalog line does not name this vehicle. Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | Used only | |
| BRP Hot Rods Cast aluminum retro LS oil pan kit Listed 2WD | — | $299.00 2026-10-01 | 1973-1987 2WD GM trucks for 2WD only | Check price & fitment | In production |
Steering
3 optionsWhy you need it: The engine and headers have to clear the steering shaft and box, and some swaps need a new shaft or box to make room. Pre-1977 trucks need a new rag-joint connector for the Borgeson box, and the factory column-shift linkage hits swap headers; the Lokar 1804 cable kit replaces it. More: steering shaft and box clearance.
Options3 options
GM (stock) Stock LS truck PS pump + '73-'87 PS hoses (SAE valve swap)1973-1987 trucks Unconfirmed Confirm this
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
donor + truck itself
Borgeson Street & Performance power steering box (12.7:1) + collapsible shaft1973-1987 C10 (bolts to stock location, stock pitman arm) · for 2WD only Unconfirmed Confirm this
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
Direct from Borgeson
Lokar 1804 column cable shifter kit1804 · LS-swapped C/K squarebody trucks with header/shift-linkage interference Unconfirmed Confirm this
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
Direct from Lokar
Compare 3 steering options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| GM (stock) Stock LS truck PS pump + '73-'87 PS hoses (SAE valve swap) Listed | — | 1973-1987 trucks Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | donor + truck itself | Used only | |
| Borgeson Street & Performance power steering box (12.7:1) + collapsible shaft Listed | — | 1973-1987 C10 (bolts to stock location, stock pitman arm) for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Borgeson | In production | |
| Lokar 1804 column cable shifter kit Community | 1804 | LS-swapped C/K squarebody trucks with header/shift-linkage interference Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Lokar | In production |
Brakes & booster
3 optionsWhy you need it: A big cam can leave too little vacuum for the booster, and some swaps leave no room for one. The LS vacuum port is 1/2 in and the squarebody booster port 3/8 in, so add an adapter check valve; a GMT400 hydroboost swap needs its own pedal or the stroke is wrong. More: vacuum booster or hydroboost?
Options3 options
GM Brake booster check valve for LS vacuum port15823207 · Vacuum-booster trucks (LS has 1/2in vacuum port vs 3/8in booster port) Unconfirmed Confirm this
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
GM dealers / parts stores
GM (junkyard) Hydroboost unit from 90s GMT400 Chevy truck1973-1987 squarebody Unconfirmed Confirm this
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
junkyard
The Right Stuff (via First Place Auto Parts) Hydro Boost kit for 73-87 GM squarebody1973-1987 GM squarebody, manual-to-hydroboost conversion Unconfirmed Confirm this
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
First Place Auto Parts
Compare 3 brake & booster options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| GM Brake booster check valve for LS vacuum port Community | 15823207 | Vacuum-booster trucks (LS has 1/2in vacuum port vs 3/8in booster port) Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | GM dealers / parts stores | In production | |
| GM (junkyard) Hydroboost unit from 90s GMT400 Chevy truck Community | — | 1973-1987 squarebody Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | junkyard | Used only | |
| The Right Stuff (via First Place Auto Parts) Hydro Boost kit for 73-87 GM squarebody Community | — | 1973-1987 GM squarebody, manual-to-hydroboost conversion Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | First Place Auto Parts | In production |
More notes for step 2Apply to the whole step, not one part
Measure before you buy18 notes
- Most stock LS truck pans clear the crossmember but hang several inches below it; use the LH8/"Muscle Car" pan (~0.5 in below) or a Holley 302-1 or 302-2 pan (shallower).
- Forward mount position requires notching the front crossmember for pan clearance.
- Low-mount AC compressor on the Vortec truck drive hits the frame rails; delete AC or use a top-mount AC bracket.
- The 12621HKR brackets can be used with other/custom transmission crossmembers where greater engine/trans downangle is needed, e.g. 4WD trucks or lifted 2WD trucks.
- Dirty Dingo DD-2585-4 4WD mounts require a small notch on the driver side of the crossmember. 4WD
- Dirty Dingo DD-2585-4 mounts clear LS truck low-mount A/C but mount against the A/C compressor bracket, so the engine cannot slide back; Corvette/Camaro-GTO low A/C does not fit.
- Some 1973-87 trucks have a narrower 32.5 in inside frame-rail width; measure before installing CP90171.
- The Holley 302-1 pan is about 5.9 in deep, holds 5.5 qt and comes with the tray and pickup.
- Holley 302-2 is a 6-qt, 5.5-in-deep rear-sump LS retrofit pan with tray and pickup included.
- Holley 302-3 adds even more front sump clearance than the 302-2, with two 1/2-in NPT oil return bosses and clearance for a 4.00-in stroke crankshaft.
- Engine location may need to be adjusted up/down or fore/aft for crossmember or steering linkage clearance, depending on vehicle and chassis.
- Dirty Dingo 2WD 73-87 mounts clear LS truck oil pans - no special oil pan is required to clear factory steering or frame. 2WD
- For lowered 73-87 trucks, a 98-02 Camaro oil pan is the recommended choice.
- On 4x4 trucks the Dirty Dingo setup requires a small notch on the driver side of the crossmember to clear the oil pan. 4WD
- Trans-Dapt 42051's steel swap pan holds 5 qt and measures 2 in deep at the front, 6 in at the rear sump.
- Moroso 20139 is a 6-in-deep, 7-qt steel rear-sump pan for 98-02 F-body LS applications, clearing 4.25-in stroke.
- Holley's 302-2 swap pan provides more clearance at the front half of the pan than the 302-1, and is the recommended oil pan for 1975-86 K10 LS swaps. 4WD
- Late-model factory oil pans don't fit or hang too low during an LS swap; Holley swap pans maximize chassis and ground clearance.
Kit-specific notes65 notes
- Hooker BlackHeart BHS540 engine mount brackets are designed for 1973-1987 C10/C20 2WD trucks and 1973-1982 2WD Blazer/Jimmy, fitting GM LS and Gen-V LT engines. 2WD
- BHS540 replaces the truck's original frame stands rather than using universal or adjustable swap plates.
- BHS540 uses clamshells 71221018HKR for LS engines or 71221019HKR for Gen-V LT, with polyurethane inserts 71221016HKR (black) or 71221017HKR (red) and bolts 71223015HKR.
- BHS540's modular design lets the engine change from LS to Gen-V LT by changing only the clamshell components; brackets, inserts, bolts and crossmember stay the same.
- BHS540 is listed as working with Holley LS swap pans 302-1, 302-2 and 302-3, plus the Gen-V LT swap pan 302-20.
- BHS540 allows low-mount A/C with both truck-style accessories and LSA supercharged engines.
- Hooker 12621HKR standard engine mount brackets work with the stock small-block Chevy clamshell mounts.
- The 12621HKR adapter plates are 0.38-in thick steel with an LS bolt pattern of 4-3/8 x 3-1/8 in, an SBC 3-1/2-in triangle, and 4-in clamshell spread.
- With the 12646HKR crossmember, the 12621HKR brackets set an engine/trans inclination optimized for typical bolt-in suspension drop kits up to 5 in front / 7 in rear.
- 12621HKR installation requires new stock OE-style clamshell mounts (Anchor 2292 rubber replacements, or Hooker 71221004HKR cages with 712210014HKR/71221015HKR poly inserts); old clamshells must not be reused.
- Hooker validated Holley 302-1, 302-2 and 302-3 LS oil pans as bolt-in compatible with the 12621HKR bracket kit.
- Dirty Dingo DD-2500C mounts are precision CNC laser-cut from 0.250-in thick 1050 high-carbon cold-rolled steel.
- Dirty Dingo DD-2500C mounts are slotted to move the engine up to 2-1/2 in forward or 1/2 in rearward of the original bellhousing position.
- Dirty Dingo DD-2500C conversion mounts are designed to be used with the factory rubber clamshell-style mounts on the original frame.
- Dirty Dingo DD-C10-TRANS adjustable transmission crossmember bolts to the frame using the existing transmission mounting holes.
- The ICT Billet 5510-KIT003EM includes 2 OE-style rubber mounts, 2 upper mounts, instructions and mounting hardware.
- ICT Billet torque specs for the kit: clamshell-to-engine 37 lb-ft, mount-to-frame 37 lb-ft, mount through-bolt and nut 74 lb-ft.
- ICT Billet 5510-KIT003EM fits 1973-1987 C10/C20/C30/K10/K20/K30 2WD/4WD pickups and Suburbans, 1973-1982 Blazer C1500 2WD and 1973-1986 Blazer K1500 4WD.
- CPP 7387ELS-K-HM LS install kit for 73-87 Chevy trucks includes engine stands, adjustable engine mounts (high mount or no A/C), a transmission crossmember, cast-iron manifolds with head pipes, and polyurethane mounts.
- Holley BHS5110 1973-1987 K10 4WD engine-mount crossmember offers two discrete fore/aft engine positions; the rear position puts the engine/trans mating plane at the stock small-block Chevy fore/aft location. 4WD
- BHS5110 must be used with 71221016HKR mounts and 71221018HKR clamshells for LS (71221019HKR clamshells for LT).
- Installing the BHS5110 requires removing the factory engine stands first, then replacing them with the new crossmember assembly.
- With BHS5110, the listed transmissions install using the stock transmission crossmembers and a 1985-up K-truck transmission mount.
- Hooker BHS549 is the 4L80E/4L85E transmission crossmember for 1973-1987 C10/15 2WD (also 1979-1987 C20 2WD and 1973-1982 Blazer/Jimmy 2WD); it is used with BHS540 brackets and also works with 12621HKR. 2WD
- BHS549 (4L80) uses a supplied 1-in spacer with the frame feet mounted with the long angle of the plate facing forward.
- BRP Hot Rods sells a 1973-1987 2WD truck LS engine mounts and frame bracket kit ($299.00). (as listed 2026-09-30) 2WD
- BRP Hot Rods sells a 1973-1987 GM truck LS swap transmission crossmember, 2WD only ($309.00). (as listed 2026-09-30) 2WD
- Dirty Dingo DD-LS-CLAM1 is a pair of factory-replacement GM 4-bolt clamshell mounts for 1973-87 2WD Chevy, GMC, Blazer and Suburban. 2WD
- Holley 302-1: cast-aluminum rear-sump LS swap pan, 5.5-qt sump (6 qt with stock filter), rated to 4.25-in crankshaft stroke.
- The Holley 302-1 fits GM rear-wheel-drive applications originally equipped with a small- or big-block Chevy and a traditional rear-sump oil pan.
- Holley 302-1BK is the black powdercoated version of the 302-1 LS swap oil pan.
- Holley 302-3 holds 5.6 qt in the sump, 6.1 qt total with a stock oil filter.
- The Holley 302-3 requires Holley's 302-15 dipstick/tube kit, or an LS3 dipstick (GM 12669528) and tube (GM 12625031).
- The Holley 302-1 oil pan works with the Hooker 12621HKR engine mount brackets on a 1973-87 C10.
- BRP Hot Rods sells a cast-aluminum retro LS oil pan kit for the 73-87 2WD truck swap ($299.00). (as listed 2026-09-30) 2WD
- The Chevrolet Performance 12628771 aluminum oil pan fits just like the stock rear sump style oil pan for 1998-2002 Camaro/Firebird with the LS1 engine.
- For a 4L80E/4L85E in a 1973-87 C-10/20 2WD, use crossmember 12646HKR. 2WD
- For a 4L60E-4L75E in a 1973-87 C-10/20 2WD, use crossmember 12646HKR. 2WD
- For a T56 or T56 Magnum in a 1973-87 C-10/20 2WD, use crossmember 12646HKR plus adapter bracket 12645HKR. 2WD
- A TH350, 700R4, T56 or T56 Magnum on the 12646HKR crossmember (1973-87 C-10/20 2WD) needs the 12645HKR adapter bracket. 2WD
- For a TH350 in a 1973-87 C-10/20 2WD, use crossmember 12646HKR plus the 12645HKR adapter bracket. 2WD
- For a 700R4 in a 1973-87 C-10/20 2WD, use crossmember 12646HKR plus the 12645HKR adapter bracket. 2WD
- The Hooker 12646HKR crossmember provides dual-arch exhaust passages for installing Hooker 2.5-inch or 3-inch exhaust systems on 1973-87 C10/C20 2WD trucks. 2WD
- The Hooker BHS548 crossmember for a 4L60E uses the supplied 11/16-inch spacer with the frame feet mounted so the long angle of the plate faces rearward.
- The Hooker BHS549 crossmember for a 4L80 uses the supplied 1-inch spacer with the frame feet mounted so the long angle of the plate faces forward.
- The Hooker BHS550 crossmember for a T56 requires no spacer, with the frame feet mounted so the long angle of the plate faces rearward.
- Use the Hooker 71223029HKR, 71223030HKR, or Anchor 2268 transmission mount with its BHS548/BHS549/BHS550 swap crossmembers.
- The Hooker swap crossmember's engine/transmission positioning is designed for compatibility with the Holley 302-1, 302-2, and 302-3 LS oil pans.
- For 4L80E/4L85E transmissions, Hooker requires attaching the optional 71223013HKR adapter bracket to the bottom of the transmission extension housing.
- For T56 Magnum installations, Hooker directs placing the included spacer between the crossmember and the transmission mount.
- For LS F-Body/GTO T56 installations, Hooker directs discarding the included spacer and lowering the mount directly onto the crossmember.
- For TH400 or 2004R installations, Hooker directs discarding the included spacer and placing the optional 12650HKR spacer block between the crossmember and the mount.
- Aeromotive directs installing the supplied aluminum remote-mount rollover valve on the vent nipple above the pump hat.
- Be Cool lists SKU 60213 as fitting the 73-87 Chevrolet C10 Pickup and the 73-87 GMC C15 Pickup.
- PSI's 1999-2007 24X drive-by-cable controller kit for 4L60E/4L80E includes a complete standalone engine harness, MAF sensor, two upstream O2 sensors, TCC brake switch, and a PCM flashed for the application with a mounting bracket ($1,099.00). (as listed 2026-09-30)
- PSI harnesses give 4-5 feet of length from the rear of the cylinder head to the PCM mounting position under the vehicle dashboard, with a sliding grommet seal for firewall pass-through.
- PSI's Gen IV DBC harness includes EV6 injector connectors plus provisions for low-mount (Gen III) knock sensors and a front-mounted cam sensor.
- PSI's Gen IV/V electronic pedal bracket uses the factory mounting holes and only works with the Corvette-style pedal (PSI part ACC-1007, $115.00). (as listed 2026-09-30)
- The ICT 551675 crossover will not work with passenger-side mounted alternator bracket kits and is not compatible with FAST 92 or 102 intake manifolds.
- ICT Billet 551780-3 high-mount passenger alternator bracket fits 99-13 GM truck/SUV and 10-15 Camaro harmonic balancers and all LS truck 5.46-inch bolt pattern alternators.
- The ICT 551780-3 kit includes the bracket, idler pulley, tensioner, mounting hardware, and instructions.
- ICT alternator bracket torque specs: flange bolts M10 = 37 lb-ft, FHSC bolts M10 = 31 lb-ft.
- ICT 551587-3 turbo alternator relocation bracket fits a 1998-2002 LS1 Camaro water pump with spacers, or an L99/LS3 Camaro SS water pump without spacers, and requires a 105-amp case alternator.
- Dirty Dingo LS R4 A/C compressor bracket for squarebodies: part DD-LS-R4-AC-TR.
- Dirty Dingo LS Sanden A/C compressor bracket for squarebodies: part DD-SANDEN-AC-TR.
Everything else8 notes
- Stock ECM is recommended unless very high power, but it needs a tune (VATS delete, DTCs); Gen IV engines need a drive-by-wire pedal mount.
- Trans-Dapt 4205 is a bolt-on polyurethane/steel LS swap motor mount kit for GM full-size SUV/trucks 1973-87.
- Trans-Dapt 42051 swap-in-a-box for 1973-87 2WD trucks includes an engine mount kit, headers, an LS swap oil pan, and a transmission crossmember for 4L60E/4L70E/4L80E/4L85E/6L85E/6L90E. 2WD
- Commonwealth Chassis Works 73-87 C10 bolt-in LS mounts are CNC laser-cut from 1/4-in plate with a 3-in polyurethane bushing and slider frame-side mounts allowing 1.5 in of fore/aft movement.
- The DD-C10-TRANS crossmember works with Anchor 2268/2811 or Energy Suspension 3.1108 trans mounts; newer 4L80s use GM 23134733; 6L80E/6L90E use Anchor 2392 or Energy 3.1158.
- The Trans-Dapt 42051 pan has -10AN inlet/outlet ports and requires relocation of the oil filter.
- Speartech sells its Gen IV 58x LS swap harnesses two ways: the standalone swap harness alone, or a complete package with programmed ECM, programmed TCM, and an easy-mount electronic throttle pedal.
- Vintage Air complete kits include the compressor, mounting bracket, condenser kit assembly with safety switch, refrigerant hose kit, and interior evaporator kit.
Why this step matters: 42 of 274 owner questions about this vehicle
- What oil pan fits an LS3 swap in a square body without hitting the crossmember?
- Does a lowered truck need a different oil pan, or will the stock truck LS pan work?
- Do I need new driveshafts when swapping to an overdrive transmission behind an LS?
- What is the best motor-mount option for a 5.3 going into a 1968 C10 — reuse the '68 stands or go to 73-87 stands with Dirty Dingo adapters?
- What makes the front driveshaft hit the transmission crossmember on a lifted square body?
More: Mounts & swap kits guide · Oil pan guide · Steering clearance guide
Ready for the next step when you've picked where the engine sits and an oil pan that clears it.
Next: transmission & driveline →3Transmission & drivelinePick the transmission and how it shifts, then the parts behind it · 3 parts
DecideWhich transmission handles your torque and how it will be controlled, then plan the crossmember, driveshaft length and flexplate or bellhousing to match.
BuySpeedway Motors Gen 3 LS to TH350/700R4/Powerglide Transmission Adapter Kit $313.99Direct from Speedway MotorsTransmission adapter & clutch (for 24x Gen III engines, TH350/700R4/Powerglide) · alternatives in 3A
Must know
- Pre-1988 trucks (pre-1992 SUVs) must reuse the original transfer case (front driveshaft exits passenger side).
Transmission adapter & clutch
7 options · $30.99–$313.99Why you need it: An LS needs its own bellhousing or adapter and the right flexplate or flywheel, and an electronic transmission needs a computer to shift it. A K10 built before 1988 keeps its original transfer case (front shaft exits on the passenger side); adapting a 4L-series to it means removing the tailshaft housing. More: transmission guide.
Our pick and alternativespick + 2 of 7
Our pick · for 24x Gen III engines, TH350/700R4/PowerglideSpeedway Motors Gen 3 LS to TH350/700R4/Powerglide Transmission Adapter KitOnly if keeping an old-style transmission
$313.99 (2026-09-28)Direct from Speedway Motors
Speedway Motors LS Crankshaft TH350/TH400/700R4 Torque Converter Adapter Sleeve
$30.99Direct from Speedway Motors
Speedway Motors LS1/LS2/LS6/5.3/6.0 to TH350/700R4/4L60 Adapter FlexplateKeeps original trans
$247.99Direct from Speedway Motors
Compare 7 transmission adapter & clutch options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Speedway Motors Gen 3 LS to TH350/700R4/Powerglide Transmission Adapter Kit Verified Our pick | — | $313.99 2026-09-28 | Only if keeping an old-style transmission | Direct from Speedway Motors | |
| Speedway Motors LS Crankshaft TH350/TH400/700R4 Torque Converter Adapter Sleeve Verified | — | $30.99 2026-09-28 | Direct from Speedway Motors | ||
| Speedway Motors LS1/LS2/LS6/5.3/6.0 to TH350/700R4/4L60 Adapter Flexplate Verified | — | $247.99 2026-09-28 | Keeps original trans | Direct from Speedway Motors | |
| GM Performance Flexplate spacer kit for early automatics Listed | 12563532K | LS to TH350/TH400 and other early automatics Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | GM Performance dealers | In production | |
| Amazon/aftermarket TH400 crank spacer adapter Listed | 12563532 | LS to TH400 in 1973-1987 C10 for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Buy | In production | |
| GM (direct bolt-up) 4L60E / 4L80E / 6L80E / T-56 - no adapter needed Listed | — | Any LS engine Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | donor truck | Used only | |
| McLeod LS conversion clutch/flexplate components Community | — | LS to manual/early-auto conversions Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from McLeod | In production |
Crossmember
13 options · $74.99–$318.95Why you need it: The transmission mount usually moves, and the crossmember sets the driveline angle. The G Force RCC10-3 and BRP units are 2WD only, and Speed Engineering's is drawn around ICT plates in the furthest-back position. Shim the trans mount up, never down. More: getting driveline angles right.
Options3 of 13
Hooker BlackHeart Transmission Crossmember Add-On Bracket TH350 700R4 PG 2WD12645HKR · transmission crossmember; 1973-1987; 2WD; transmissions: TH350; 700R4; Powerglide; T56; T56 Magnum. Adapter bracket required with 12646HKR for TH350/700R4/T56/T56 Magnum behind LS in 73-87 C-10/C15 2WD and 79-87 C20 2WD · for 2WD only
$74.99Check price & fitment
Dirty Dingo LS Conversion Swap C10 Adjustable Transmission Crossmember 2WDDD-C10-TRANS · transmission crossmember; 1973-1987; 2WD; transmissions: Powerglide; TH350; TH400; 700R4; 4L60; 4L65; 4L70; 4L75; 4L80; 6L80; 6L90. Bolts into 2WD 1963-87(91) C10/C20 trucks Blazers Suburbans incl R/V; 1-3/4 in tubing; clears 4 in exhaust; oversized shipping · for 2WD only
$159.99Direct from Dirty Dingo
G Force Performance Engineering 1973-1987 Chevy C10 LS Swap CrossmemberRCC-10-3 · transmission crossmember; 1973-1987; 2WD; transmissions: 700R4; 4L60; 4L60E; 4L65E; 200-4R; TH400; Powerglide; TH350; 4L80E; 6L80E; Muncie; T10; TKO; TKX; T56; T56 Magnum; TR6060. C10 2WD only - not 4WD; bolts into factory holes; dual exhaust under crossmember; source lists TR6060 with a question mark · for 2WD only
$238.00Check price & fitment
Compare 13 crossmember options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Hooker BlackHeart Transmission Crossmember Add-On Bracket TH350 700R4 PG Verified 2WD | 12645HKR | $74.99 2026-09-30 | transmission crossmember; 1973-1987; 2WD; transmissions: TH350; 700R4; Powerglide; T56; T56 Magnum. Adapter bracket required with 12646HKR for TH350/700R4/T56/T56 Magnum behind LS in 73-87 C-10/C15 2WD and 79-87 C20 2WD for 2WD only | Check price & fitment | |
| Dirty Dingo LS Conversion Swap C10 Adjustable Transmission Crossmember Verified 2WD | DD-C10-TRANS | $159.99 2026-09-30 | transmission crossmember; 1973-1987; 2WD; transmissions: Powerglide; TH350; TH400; 700R4; 4L60; 4L65; 4L70; 4L75; 4L80; 6L80; 6L90. Bolts into 2WD 1963-87(91) C10/C20 trucks Blazers Suburbans incl R/V; 1-3/4 in tubing; clears 4 in exhaust; oversized shipping for 2WD only | Direct from Dirty Dingo | |
| G Force Performance Engineering 1973-1987 Chevy C10 LS Swap Crossmember Verified | RCC-10-3 | $238.00 2026-09-30 | transmission crossmember; 1973-1987; 2WD; transmissions: 700R4; 4L60; 4L60E; 4L65E; 200-4R; TH400; Powerglide; TH350; 4L80E; 6L80E; Muncie; T10; TKO; TKX; T56; T56 Magnum; TR6060. C10 2WD only - not 4WD; bolts into factory holes; dual exhaust under crossmember; source lists TR6060 with a question mark for 2WD only | Check price & fitment | |
| Pro LSX Parts LS Swap C10 Crossmember 1973-1987 2WD Verified 2WD | — | $249.99 2026-09-30 | transmission crossmember; 1973-1987; 2WD; transmissions: all GM 2WD transmissions. Tucks 3 in exhaust inside frame rails; no manufacturer part number shown; currently sold out for 2WD only | Check price & fitment | |
| Hooker BlackHeart Transmission Crossmember 4L60E 73-87 C10 Verified 2WD | BHS548 | $268.95 2026-09-30 | transmission crossmember; 1973-1987; 2WD; transmissions: 4L60E; 4L65E; 4L70E; 4L75E; 6L80E. Fits 73-87 C10/15 2WD 79-87 C20 2WD 73-82 Blazer/Jimmy 2WD; use with BHS540 mounts; 3 in dual exhaust clearance; black powdercoat for 2WD only | Buy | |
| Hooker BlackHeart Transmission Crossmember LS Swap 73-87 C10/C20 2WD Verified 2WD | 12646HKR | $299.99 2026-09-30 | transmission crossmembers; 1973-1987; 2WD. CAD/FEA welded steel; use with 12621HKR engine mounts; not compatible with Tremec TR6060; available at Southwest Speed; note: RealStreet lists the mfr as discontinued - stock may be limited for 2WD only | Buy | |
| Hooker Blackheart Transmission Crossmember T56 T56 Magnum Verified 2WD | BHS550 | $318.95 2026-09-30 | transmission crossmember; 1973-87; 2WD; transmissions: T56; T56 Magnum. LS/LT swap crossmember for T56 and T56 Magnum; also fits 79-87 C20 2WD and 73-82 Blazer/Jimmy 2WD; use with BHS540 brackets; welded steel black powder coat; sale 318.95 reg 358.95 for 2WD only | Buy | |
| Tejas SteelWorks High clearance transmission crossmember, 2WD Listed 2WD | — | 1973-1987 Squarebody, 2WD. 4L60E, 4L80E, TH200-4R, TH700-R4, TH350, TH400, or Powerglide. Doesn't fit: 4WD. for 2WD only | Check price & fitment | Small batch | |
| Hooker Blackheart LS/LT swap transmission crossmember Listed 2WD | 79-509 | 1973-1987 C10/15 2WD, 1979-1987 C20 2WD, 1973-1982 Blazer/Jimmy 2WD; 4L80E/4L85E for 2WD only | Check price & fitment | In production | |
| GM (stock, reused) Stock transmission crossmember, relocated Listed | — | 1973-1987 trucks; pilot build ran factory crossmember in rearmost location with 4L80E Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | truck itself | DIY | |
| Speed Engineering 1963-1987 C10 LS swap transmission crossmember Listed | CM-63-87-C10 | $200.00 sale ($234.00 reg) 2026-10-01 | 1963-1987 C10; TH350/TH400/700R4/4L60E/4L80E/6L80/90/8L90 for 2WD only | Check price & fitment | In production |
| G Force Performance C10 LS swap transmission crossmember RCC10-3 Listed 2WD | RCC10-3 / RCC-10-3 | $260.00 (Ecklers, out of stock at crawl) / $238.00 (Modern Day Muffler) 2026-10-01 | 1973-1987 C10 2WD; 700R4/4L60E/TH350/TH400/4L80E/6L80E/T56 and more Doesn't fit: 4WD - will not work on 4WD vehicles for 2WD only | Buy | In production |
| BRP Hot Rods 1973-1987 GM Truck crossmember (2WD only) Listed 2WD | — | $309.00 2026-10-01 | 1973-1987 2WD GM trucks Doesn't fit: 4WD for 2WD only | Direct from BRP Hot Rods | In production |
Driveshaft
3 options · $300Why you need it: A different transmission is almost always a different length, so plan on a custom-length driveshaft. Engine position changes the length: Tejas plates (engine 3 in forward) need a longer shaft, and even a kit that keeps the stock position can need a different length with a new transmission, so measure before you reuse the original shaft. More: driveshaft length and angles.
Options3 options
Driveshaft shop (local) Engine-donor driveshaft cut to size and rebalanced1973-1987 C10 LS swaps · for 2WD only Unconfirmed Confirm this
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
donor truck + local shop
Denny's Driveshafts Custom made-to-order driveshaftAny LS swap application (built to your measurements) Unconfirmed Confirm this
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
~$400-$500Direct from Denny's Driveshafts
Driveshaft shop (local) Donor driveshaft shortened, new U-joints, rebalanced1973-1987 LS swaps (e.g. NV3500 5-speed SWB) Unconfirmed Confirm this
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
~$300 (shorten + 2 U-joints + balance)local driveshaft shop
Compare 3 driveshaft options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Driveshaft shop (local) Engine-donor driveshaft cut to size and rebalanced Listed | — | 1973-1987 C10 LS swaps for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | donor truck + local shop | Used only | |
| Denny's Driveshafts Custom made-to-order driveshaft Listed | — | ~$400-$500 older forum refs | Any LS swap application (built to your measurements) Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Denny's Driveshafts | In production |
| Driveshaft shop (local) Donor driveshaft shortened, new U-joints, rebalanced Community | — | ~$300 (shorten + 2 U-joints + balance) ~2022 | 1973-1987 LS swaps (e.g. NV3500 5-speed SWB) Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | local driveshaft shop | DIY |
More notes for step 3Apply to the whole step, not one part
Measure before you buy1 note
- The DD-C10-TRANS is CNC-bent 1-3/4-in diameter tubing with 1/4-in plates, clearing long-tube headers and exhaust up to 4 in diameter.
Kit-specific notes19 notes
- Don't reuse the original driveshaft; target driveline angles ~2° down at the trans and ~2° up at the pinion.
- BHS540 pairs with transmission crossmembers BHS548 (4L60E/4L65E/4L70E/4L75E/6L80), BHS549 (4L80E/4L85E) or BHS550 (T56/T56 Magnum).
- On a 1983-87 2WD truck originally SBC/700R4, an LS plus 4L60 swap with 12621HKR needs no driveshaft or shift-linkage modification. 2WD
- On 1973-80 trucks, a TH350, 700R4 or T56 on the Hooker 12646HKR crossmember may need transmission-tunnel work.
- ICT Billet 5510-KIT003EM retains the factory SBC crankshaft and bellhousing location, so no transmission tunnel, driveshaft or linkage modifications are needed.
- The CPP 73-87 LS kit covers LS engines except LS7, and transmissions 4L60E, 700-R4, TH350 and TH400.
- CPP CP90171 transmission crossmember for 1973-1987 C10/C20/C30 is 33.125 in overall and fits TH350, TH400, 700R4, 4L60, 4L60E, 4L80E and 2004R.
- At the BHS5110 rear position, use GM transfer-case adapter 15724744 for 4L60/4L65/4L70 or adapter 24241166 for 6L80, so factory transfer case and driveshaft positions are retained.
- 4L60-4L75E and 4L80E/4L85E installations in 1973-80 trucks may require transmission tunnel modification.
- The Hooker 12646HKR crossmember installs a 4L60-4L75, 4L80/4L85, TH400, or 2004R automatic transmission as packaged, without additional adapter parts.
- Hooker highly recommends installing new body bushings before performing an engine/transmission swap in a 1973-87 GM truck.
- American Powertrain's Hydramax kits work with any TREMEC transmission including the T5, TKO/TKX, and T-56 Magnum 6-speed.
- Converting a 58x Gen IV engine (LS3, etc.) to drive-by-cable with a 411 PCM (red/blue connectors) requires a Lingenfelter crank signal converter box, available through PSI.
- PSI's Gen IV automatic harness requires a 2007-or-newer 4L60E (or a 4L80E); earlier 4L60E units are not accepted.
- PSI's 07-14+ Gen 4 58x DBW auto harness (HAR-G4WA) covers 2007-2014+ 58x engines including LS2 6.0, LS3 6.2, LS7, GMPP LS376, and Vortec LY6/L92/L76/LMG 4.8/5.3/6.0/6.2 with automatic transmissions and E38 ECM.
- BP Automotive's Gen III drive-by-wire 24x 4L60E standalone harness with Multec injectors (H353) sells for $600. (as listed 2026-09-30)
- BP Automotive covers Gen III 24x DBW truck/SUV swaps with three harness variants: H353 (4L60E), H355 (4L80E), and H354 (T56 or non-electronic).
- Advance Adapters 50-5310 4L60E-to-NP205 27-spline adapter housing is a direct replacement for the stock cast-iron housing on 1971-1979 GM trucks originally equipped with TH350 and NP205.
- The AA 4L60E/NP205 kit includes a one-piece GM 700R4-style output shaft made from 4340 alloy steel.
Everything else14 notes
- Mechanical fan needs a Gen III Vortec water pump, shroud and fan clutch.
- Old GM trans to LS needs an adapter flexplate plus a crank torque-converter sleeve.
- The DD-C10-TRANS supports Powerglide, TH350, TH400, 700R4, 4L60, 4L65, 4L70, 4L75, 4L80, 6L80 and 6L90.
- US Shift catalog number USQ4GM1 is the Quick 4 transmission controller and wiring harness package for GM 4L80E and 4L60E transmissions.
- The US Shift Quick 4 controller in the USQ4GM1 package ships preloaded with a calibration for a 4L80E transmission.
- American Powertrain offers its Hydramax bolt-in under-dash hydraulic clutch and pedal kits for the 1973-87 GM Squarebody Truck.
- American Powertrain's Hydramax conical slave cylinder ships pre-bled and dual-sealed with shims to set the distance to the clutch fingers.
- American Powertrain's Hydramax system uses an integrated under-dash hydraulic master cylinder and a bolt-in clutch pedal.
- A 24x LS2 converting to drive-by-cable needs no crank signal converter box, but does require a 411 PCM with red/blue connectors.
- Speartech's shelf 58x harnesses use a 42-inch in-car harness layout set up for GM E38 ECMs and T42 TCMs (for 4L60 or 4L80E).
- Advance Adapters' 4L60E/NP205 kit is designed around a coupler centered on the transmission and transfer case splines.
- The 1996-up 4L60E is 21.5 inches long overall with a removable bellhousing and a hex-style output bolt pattern similar to the TH400.
- Advance Adapters' 51-0405 kit makes a late-model 4L60E functionally equivalent to a 700R4 when used with the NP205 transfer case.
- The AA 4L60E/NP205 adapter includes a clamp-on reluctor ring that generates a 40-pulse-per-output-shaft-revolution VSS signal.
Answered for this vehicle1 answer
Why this step matters: 45 of 274 owner questions about this vehicle
- How do you mate a 4L80E to an NP205 transfer case in a 72 K10, and how do you get VSS?
- How do I make a 700R4 survive behind an LS in a square body?
- Which transfer case should I run behind a 4L80E, 6L80/90, or 4L60E in an LS-swapped square body?
- What is involved in swapping a 4L80E behind an LS in a 4x4 square body?
- Should the transmission cooler run through the radiator or separately on an LS swap?
Ready for the next step when you've picked the transmission and how it's controlled, and know the crossmember, driveshaft and flexplate or bellhousing it needs.
Next: accessories & cooling →4Accessories & coolingOne accessory spacing, then cooling and A/C · 3 parts
DecideOne accessory drive spacing, and match the balancer, water pump and brackets to it.
BuyBills Hot Rod Co. LS Accessory Drive Kit (alternator, AC, water pump, PS, brackets) $1,159.99Direct from Bills Hot Rod Co.Accessory drive · alternatives in 4A
CheckCheck fan, hose and hood clearance.
Must know
- Vortec truck accessory drives don't fit with the AC compressor; F-body drives fit.
Accessory drive
6 options · $30–$3,799.95Why you need it: The balancer, water pump, brackets and pulleys must all be one spacing, or the belt won't line up. With the 2010 Camaro water pump the idler between alternator and PS pump has to move; Kwik's High & Tight bracket tucks the pump 9/16 in inward for frame and steering-box clearance. More: accessory drive guide.
Our pick and alternativespick + 2 of 6
Our pickBills Hot Rod Co. LS Accessory Drive Kit (alternator, AC, water pump, PS, brackets)200 Series (Mid) · Budget complete accessory drive
$1,159.99 (2026-09-28)Direct from Bills Hot Rod Co.
Holley Premium Mid-Mount LS7 Complete Accessory System20-190 · Part of our standard recipe
$3,799.95Buy
GM (donor) Stock LS truck accessory drive (alt, PS pump, brackets)1973-1987 C10 with Tejas forward engine position · for 2WD only Unconfirmed Confirm this
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
engine donor
Compare 6 accessory drive options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Bills Hot Rod Co. LS Accessory Drive Kit (alternator, AC, water pump, PS, brackets) Verified Our pick | 200 Series (Mid) | $1,159.99 2026-09-28 | Budget complete accessory drive | Direct from Bills Hot Rod Co. | |
| Holley Premium Mid-Mount LS7 Complete Accessory System Verified | 20-190 | $3,799.95 2026-09-28 | Part of our standard recipe | Buy | |
| GM (donor) Stock LS truck accessory drive (alt, PS pump, brackets) Listed | — | 1973-1987 C10 with Tejas forward engine position for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | engine donor | Used only | |
| Kwik Performance High & Tight Alt/PS bracket K10611 + Wide Mount HD AC bracket K10472 Listed | K10611 / K10472 | C10 and OBS LS swaps; truck/Camaro (1999-2013) belt spacing for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | In production | |
| Gates Serpentine belts for swap combos Listed | K061015 (Camaro pump) / K040378HD (A/C drive, truck) | 1973-1987 C10 LS swaps for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Buy | In production | |
| AC Delco + Dirty Dingo 2010 Camaro water pump kit + LS truck idler relocation bracket Listed | AC Delco 251734 / Dirty Dingo DD-LS-IRB | ~$30 (idler kit) 2015 (Tejas guide) | 1973-1987 C10 LS swaps for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Buy | In production |
Cooling
17 options · $42.99–$1,796.99Why you need it: LS water pumps put both hoses on the passenger side and the engine needs a steam line, so the radiator needs LS-style ports or an adapter. With Tejas's forward engine position a clutch fan won't fit, so run electric fans and a shroud; Gates 22436 upper hose suits the truck pump, 23080 the 2010 Camaro pump. More: radiator, fans and steam line.
Our pick and alternativespick + 2 of 17
Our pick · for 2WD onlyDeWitts LSX Conversion Radiator, 1973-87 C1032-6239019A · Stock radiator is fine if healthy (unless originally V6)
$1,796.99 (2026-09-28)Check price & fitment
Speedway Motors LS Swap Radiator Hose Adapter w/ Steam Port, 1.5–1.25 inFor reused factory V8 radiator
$42.99Direct from Speedway Motors
Speedway Motors 1966-90 GM A-Body/B-Body/Truck Aluminum RadiatorUpgrade option
$303.99Direct from Speedway Motors
Compare 17 cooling options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| DeWitts LSX Conversion Radiator, 1973-87 C10 Verified Our pick · for 2WD only | 32-6239019A | $1,796.99 2026-09-28 | Stock radiator is fine if healthy (unless originally V6) for 2WD only | Check price & fitment | |
| Speedway Motors LS Swap Radiator Hose Adapter w/ Steam Port, 1.5–1.25 in Verified | — | $42.99 2026-09-28 | For reused factory V8 radiator | Direct from Speedway Motors | |
| Speedway Motors 1966-90 GM A-Body/B-Body/Truck Aluminum Radiator Verified | — | $303.99 2026-09-28 | Upgrade option | Direct from Speedway Motors | |
| Cold Case 77-87 Chevy/GMC Truck LS Swap AT 21in Aluminum Radiator Verified | CR-GMT556A21LS | $439.54 2026-09-30 | radiators/fan; 1977-87. 21in aluminum radiator for LS swap and AT; polished OE style tanks; designed for external trans cooler; MSRP 527.45 for 1977–1987 only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| Cold Case Radiators 21 in LS Swap Aluminum Radiator & 12 in Fan Kit AT Verified | CR-GMT556A21LSK | $690.54 2026-09-30 | radiators/fan; 1977-1987. Steam-port equipped LS swap radiator w/ 12 in fan; MSRP 828.65; drive not stated Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| DeWitts Pro Series Direct Fit Aluminum Radiator Natural No Cooler Verified 2WD | 32-1139019M | $805.99 2026-09-30 | radiators/fan; 1973-1987; 2WD. 2-row 1 in tube aluminum; manual trans; lifetime warranty; page lists LS swap variants HD direct-fit radiator. DeWitts points LS swaps at a different radiator. confirm for your truck | Direct from DeWitts | |
| DeWitts Pro Series Direct Fit Aluminum Radiator Natural Auto Cooler Verified 2WD | 32-1139019A | $911.99 2026-09-30 | radiators/fan; 1973-1987; 2WD. 2-row 1 in tube aluminum; internal trans cooler w/ stock fittings; lifetime warranty HD direct-fit radiator. DeWitts points LS swaps at a different radiator. confirm for your truck | Direct from DeWitts | |
| DeWitts Pro Series Direct Fit Radiator w/ Dual 12 in Fans Natural Verified 2WD | 32-4139019M | $1,420.99 2026-09-30 | radiators/fan; 1973-1987; 2WD. SPAL dual 12 in 2900 cfm fans preinstalled w/ wiring harness and temp switch; manual trans HD direct-fit radiator. DeWitts points LS swaps at a different radiator. confirm for your truck | Direct from DeWitts | |
| DeWitts Pro Series Direct Fit Radiator w/ Dual 12 in Fans Natural Auto Cooler Verified 2WD | 32-4139019A | $1,526.99 2026-09-30 | radiators/fan; 1973-1987; 2WD. SPAL dual 12 in fans preinstalled; internal trans cooler; lifetime warranty HD direct-fit radiator. DeWitts points LS swaps at a different radiator. confirm for your truck | Direct from DeWitts | |
| ICT Billet Frostbite - 73-87 C10 Dual Fan and Shroud Kit Listed | HLY-FB522E | $585 2026-09-29 | for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | Out of stock |
| ICT Billet Frostbite - LS Swap Radiator for 73-87 C10 Trucks Listed | HLY-FB305 | $850 2026-09-29 | for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | Out of stock |
| Spectra Premium OE 454 HD cooling radiator (aluminum core/plastic tanks) Listed | — | 1973-1987 GM trucks (same as '87 factory LS-style construction) Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | RockAuto / parts stores | In production | |
| GM (junkyard) '93-'97 Camaro/Firebird V8 electric fan Listed | — | 1973-1987 C10 with Tejas fan shroud for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | junkyard | Used only | |
| Ford (junkyard) Taurus electric fan (DIY) Listed | — | 1973-1987 C10 for 2WD only | junkyard | Used only | |
| Gates / AC Delco Radiator hoses + fan/A/C relays Listed | Gates 22436/23080 upper, 22437 lower; AC Delco 12167112 relays | 1973-1987 C10 LS swaps 22436 is a GMT800 hose, not a 1973-87 C10 LS hose. confirm the hose for your truck Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | parts stores | In production | |
| Hayden Transmission cooler (for 4L80E) Listed | — | 1973-1987 C10 with 4L80E for 2WD only | parts stores | In production | |
| BRP Hot Rods 1967-1987 GM Truck radiator with fans (auto trans) Listed | — | $1,468.99 with fans / $991.99 without 2026-10-01 | 1967-1987 GM trucks, LS swap Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from BRP Hot Rods | In production |
A/C
5 options · $298Why you need it: Where the compressor mounts (high or low) can decide frame, fender and header clearance, so pick it before you buy brackets. The stock LS truck low-mount compressor tucks inside the frame rail only with the engine forward (Tejas plates); in the stock spot the right-side mount hits it. More: accessory drive guide.
Options3 of 5
Denso (via donor) 10S17F low-mount compressor, retained in stock LS truck location 2WDDENSO 4710315 · 1973-1987 C10 with Tejas forward engine position (tucks inside frame rail) Doesn't fit: Stock engine position - right side mount interferes with low-mount compressor · for 2WD only Unconfirmed Confirm this
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
engine donor
Kwik Performance Wide Mount HD AC bracket (Sanden 709 SD7)K10472 · Classic trucks; LS truck/Camaro (1999-2013) belt spacing Unconfirmed Confirm this
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
Kwik Performance R4 AC bracket (reuse stock R4 compressor)K10623 · Marketed for 1988-95 OBS LS swaps; R4-compressor trucks Unconfirmed Confirm this
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
Compare 5 A/C options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Denso (via donor) 10S17F low-mount compressor, retained in stock LS truck location Listed 2WD | DENSO 4710315 | 1973-1987 C10 with Tejas forward engine position (tucks inside frame rail) Doesn't fit: Stock engine position - right side mount interferes with low-mount compressor for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | engine donor | Used only | |
| Kwik Performance Wide Mount HD AC bracket (Sanden 709 SD7) Listed | K10472 | Classic trucks; LS truck/Camaro (1999-2013) belt spacing Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | In production | |
| Kwik Performance R4 AC bracket (reuse stock R4 compressor) Listed | K10623 | Marketed for 1988-95 OBS LS swaps; R4-compressor trucks Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | In production | |
| Four Seasons (DIY) 78348 compressor + CN 20007XC universal condenser + custom hoses Community | 78348 / CN 20007XC / RD6071C / EX5151C | Squarebody LS swap (UTX documented build) Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Summit Racing / O'Reilly | In production | |
| Ugly Truck Experience UTX Low Mount AC bracket Listed | — | $298.00 2026-10-01 | Squarebody LS swaps keeping low-mount compressor Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | Small batch |
More notes for step 4Apply to the whole step, not one part
Measure before you buy1 note
- Be Cool's SKU 60213 LS-swap radiator for 73-87 C10 measures 34 inches wide by 19 inches high.
Kit-specific notes2 notes
- The ICT 551675 kit includes 2 o-rings, 2 bolts, 2 coolant ports, one 1/4-inch hose barb fitting to the radiator, and one stainless steel braided hose.
- ICT's ACC-TURBO1 accessory kit runs a Gates K060660 66.0-inch belt.
Everything else5 notes
- Factory V8 radiator is fine with a steam-port hose adapter.
- Be Cool's factory-fit LS-swap radiator SKU 60213 for 73-87 C10 is rated for 300-400 horsepower.
- Be Cool guarantees its radiators lower coolant temperature a minimum of 20 degrees, or your money back.
- Speartech's 58x shelf harnesses are configured for Corvette accessory-drive alternator and A/C compressor locations with a C6 Vette/GMPP/5th Gen Camaro accelerator pedal.
- Painless's LS2 DBW harness kit includes a TAC module to accelerator pedal pigtail.
Why this step matters: 31 of 274 owner questions about this vehicle
- How should electric fans be wired with a Terminator X / LS swap ECU?
- What compressor and bracket should I use to add A/C to an LS-swapped square body?
- Which water pump should I run for an LS swap: truck pump or Camaro pump?
- Where do I route the LS steam vent line on a square body swap?
- Are you LS swap guys running a Camaro water pump with the stock square-body radiator, and do the belts line up with truck accessories?
More: Accessory drive guide · Cooling guide
Ready for the next step when you've picked one accessory spacing, with the balancer, water pump and brackets to match.
Next: exhaust →5ExhaustHeaders or manifolds that clear where the engine sits · 1 part
DecideHeaders or manifolds that clear the steering, frame and starter where your mounts put the engine.
BuyDoug's Headers Full-length ceramic-coated headers 2WD $1,040.43BuyHeaders & exhaust · alternatives in 5A
Headers & exhaust
23 options · $166.99–$1,403.45Why you need it: Headers are shaped around one chassis's frame, steering and floor, so they have to be made for your vehicle and engine position. With Tejas plates (engine 3 in forward), junkyard truck manifolds land on the driver frame rail; cast swap manifolds or headers made for that position clear. 4L80E ears usually need trimming for long tubes. More: headers and exhaust by chassis.
Our pick and alternativespick + 2 of 23
Our pick · for 2WD onlyDoug's Headers Full-length ceramic-coated headers 2WDD314 · 1973-1987 Chevrolet 2WD C10 long-tube LS swap headers. Doesn't fit: 4WD.
$1,040.43 (2026-09-29)Buy
Hedman Hedders mid-length LS swap headers69710 · For lowered trucks / ground clearance
GM (junkyard) Exhaust manifoldsTrailBlazer/Envoy or 2010+ Camaro manifolds · Budget option, good to ~400 hp
Direct from GM (junkyard)
Compare 23 header & exhaust options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Doug's Headers Full-length ceramic-coated headers Verified Our pick · for 2WD only 2WD | D314 | $1,040.43 2026-09-29 | 1973-1987 Chevrolet 2WD C10 long-tube LS swap headers. Doesn't fit: 4WD. for 2WD only | Buy | |
| Hedman Hedders mid-length LS swap headers Verified | 69710 | For lowered trucks / ground clearance | Buy | ||
| GM (junkyard) Exhaust manifolds Verified | TrailBlazer/Envoy or 2010+ Camaro manifolds | Budget option, good to ~400 hp | Direct from GM (junkyard) | ||
| Speedway Motors 2.5 in Dual Exhaust Mandrel Bend Kit Verified | — | $166.99 2026-09-28 | Direct from Speedway Motors | ||
| Flowtech Shorty Headers, GM LS Universal Verified | 11575FLT | $311.95 2026-09-28 | Buy | ||
| Hooker LS Swap Cast Iron Exhaust Manifold, 2.5 in Verified | 8502-HKR | $466.95 2026-09-28 | Stock car manifolds don't fit; truck manifolds do | Buy | |
| Hooker BlackHeart Long Tube Headers Ceramic Coated 73-74 C10 2WD Verified 2WD | 70101503-1HKR | price not listed 2026-09-30 | header; 1973-1974; 2WD. Full-length LS swap; 1.75 in primary; 3 in collector; designed for 12621HKR engine mounts for 1973–1974 only, 2WD only | Buy | |
| Speed Engineering 1-7/8 in LS Swap Longtube Headers 1960-87 C10 2WD Verified | 25-1026 | $319.99 2026-09-30 | header; 1973-1987; 2WD; transmissions: 4L80E; TH350; TH400. 304 stainless; 3 in collector; graphite gaskets; explicitly NOT for 4WD (K10); LS engines only; race use only for 2WD only | Check price & fitment | |
| Hooker BlackHeart LS Swap Long Tube Headers Painted 73-74 C10/20 2WD Verified 2WD | 70101503HKR | $333.95 2026-09-30 | header; 1973-1974; 2WD. Full-length LS swap; 1-3/4 in primary; 3 in collector; black painted; use with 12621HKR mounts; sale price (was 418.95) for 1973–1974 only, 2WD only | Buy | |
| Hooker BlackHeart LS Swap Long Tube Headers Stainless 68-74 C10/20 2WD Verified 2WD | BH13243 | $1,123.95 2026-09-30 | header; 1973-1974; 2WD. 1-7/8 in primary; 3 in collector; 304 stainless natural; use w/ BHS540 premium mounts on 73-74; sale price (was 1406.95) for 1968–1974, 1973–1974 only, 2WD only | Buy | |
| Hedman Hedders 67-87 Chevy Truck LS Swap Headers T304 Stainless HTC Polished Verified 2WD | 62746 | $1,367.70 2026-09-30 | header; 1973-1987; 2WD; transmissions: manual transmissions; automatic trans floor; 4L80 w/ modification. Mid-length; 1-3/4 in primary; 3 in ball-socket collector; 2WD only; USA made; sale price (was 1504.47); sold out for 2WD only | Check price & fitment | |
| Hedman Hedders 67-87 Chevy Truck LS Swap Headers T304 Stainless Black Maxx Verified 2WD | 62743 | $1,403.45 2026-09-30 | header; 1973-1987; 2WD; transmissions: manual transmissions; 4L80 w/ bellhousing ear trimming. Mid-length; 1-3/4 in primary; 3 in ball-socket collector; 2WD only; USA made; currently sold out for 2WD only | Check price & fitment | |
| PerTronix 1973-91 Chevy Trucks and SUVs 1 3/4" Clippster LS1-LS9 Engine Swap Header with Hi-Temp Black Coating Listed | H8087-B | $499 2026-09-29 | Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | In stock |
| PerTronix 1973-88 Chevy/GMC Square Body Truck 1 7/8" Full-Length LS Engine Swap Header with Hi-Temp Black Coating Listed 2WD | D314-B | $776.35 2026-09-29 | 1973-1987 Chevrolet 2WD C10 long-tube LS swap headers. Doesn't fit: 4WD. for 2WD only | Check price & fitment | In stock |
| PerTronix 1973-91 Chevy Trucks and SUVs 1 3/4" Clippster LS1-LS9 Engine Swap Header with Metallic Ceramic Coating Listed | H8087-1 | $801.61 2026-09-29 | Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | In stock |
| PerTronix 1973-87 Chevy C10 Trucks LS1/LS6 Swap 1 3/4" Clippster Header Listed | H8087 | $485.88 2026-09-29 | for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | Out of stock |
| Speed Engineering 1-3/4 in long-tube headers, C10 LS swap Listed | — | 1973-1987 C10 LS swaps (4L80E) for 2WD only | Direct from Speed Engineering | In production | |
| GM (junkyard) LS truck exhaust manifolds Listed | — | Doesn't fit: Tejas ~3in-forward engine position - driver side lands in right frame rail space Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | junkyard / donor truck | Used only | |
| GM (junkyard) 5th Gen Camaro (2010+) exhaust manifolds Listed | — | 1973-1987 C10 LS swaps for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | junkyard | Used only | |
| eBay/Amazon sellers 98-02 Camaro stainless long-tube headers (budget) Community 2WD | — | ~$170 2011 | 1973-1987 2WD (some report they work great on 2WD) for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | eBay | In production |
| Hooker Cast iron LS exhaust manifolds (GM E-Rod design) Listed | 8501-? | $300 raw / $400 ceramic 2015 (Tejas guide) | Tejas ~3in-forward engine position; ~3in narrower at collectors than truck manifolds Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Holley / retailers | In production |
| BRP Hot Rods 1973-1987 Truck LS 1-7/8 ceramic coated mid-length headers Listed | — | $742.30 2026-10-01 | 1973-1987 2WD and 4WD trucks (separate 4WD listing) | Direct from BRP Hot Rods | In production |
| BRP Hot Rods 1973-1987 2WD Truck LS 1-7/8 ceramic coated long tube headers Listed 2WD | — | $899.00 2026-10-01 | 1973-1987 2WD trucks for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | In production |
More notes for step 5Apply to the whole step, not one part
Kit-specific notes2 notes
- Stock LS truck manifolds fit K10; stock car manifolds don't (Hooker cast manifolds fit). 4WD
- The Schoenfeld 1302LS1-C full headers have 1.75-in primaries, 3-in collectors, steel construction and silver ceramic coating for Gen III/IV LS engines.
Why this step matters: 7 of 274 owner questions about this vehicle
- What exhaust fits a 5.3 with NV4500 manual and NP205 in a 77 K10?
- What headers clear the SM465 slave cylinder on an LS swap?
- The stock 5.3 driver-side exhaust manifold points directly at the clutch Z-bar on my NV4500 swap. What exhaust will clear it?
- How do I route exhaust around a transmission crossmember that headers hit?
- What exhaust setup works for a 5.3 swap in a 1978 C20, and does C10 vs C20 matter?
More: Headers & exhaust guide
Ready for the next step when you've picked headers or manifolds that clear where your mounts put the engine.
Next: fuel system →6Fuel systemPump, lines and pressure for the LS · 1 part
DecideReturn or returnless, and a pump and injectors sized for your power and fuel (gas or E85).
BuySpeedway Motors Deluxe AN6 GM LS Swap Fuel Filter/Regulator, 58 PSI $74.99Direct from Speedway MotorsFuel system · alternatives in 6A
Must know
- Stock fuel pump won't work (mechanical pre-1987).
Fuel system
17 options · $74.99–$1,099Why you need it: An LS runs about 58 psi of fuel pressure; a carbureted system runs 5–7 psi. A baffled 1987 EFI truck tank retrofits all 1973-87 trucks; dual-tank trucks keeping both tanks need the 6-port 1987-up selector valve. More: fuel system & E85 guide.
Our pick and alternativespick + 2 of 17
Our pickSpeedway Motors Deluxe AN6 GM LS Swap Fuel Filter/Regulator, 58 PSI91012808 · C5 Corvette-style filter-regulator
$74.99 (2026-09-28)Direct from Speedway Motors
FiTech C10 LS swap fuel tank with pump and sender(tank) · "A little over $600"; approximate · for 2WD only
$600Direct from FiTech
Aeromotive Phantom In-Tank Fuel Pump System for EFI swaps18688 · In-tank preferred
$665.60Buy
Compare 17 fuel system options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Speedway Motors Deluxe AN6 GM LS Swap Fuel Filter/Regulator, 58 PSI Verified Our pick | 91012808 | $74.99 2026-09-28 | C5 Corvette-style filter-regulator | Direct from Speedway Motors | |
| FiTech C10 LS swap fuel tank with pump and sender Verified | (tank) | $600 2026-09-28 | "A little over $600"; approximate for 2WD only | Direct from FiTech | |
| Aeromotive Phantom In-Tank Fuel Pump System for EFI swaps Verified | 18688 | $665.60 2026-09-28 | In-tank preferred | Buy | |
| Tanks Inc EFI Gas Tank Kit Notched Corner 82-87 GM Pickup 255LPH Verified | TM11B-T-KIT | price not listed 2026-09-30 | fuel tanks/pump; 1982-87. GM square body EFI tank for 82-87 Chevy C/K 10 15 20 30 35 and 72-87 GMC 1500 2500 3500; notched corners for mini-tub; GPA-4 255lph Walbro module; 16 gal; 6 ft long box | Buy | |
| Boyd Welding 73-87 Bed Fill EFI Tank w/ Aeromotive Stealth 340 Verified 2WD | — | $720.00 2026-09-30 | fuel tanks/pump; 1973-1987; 2WD..125 aluminum bed-fill tank; approx 19 gal; Aeromotive Stealth 340 pump incl; no mfr part number shown; sold out at open for 2WD only | Check price & fitment | |
| Aeromotive Gen II Stealth Fuel Tank 340 LPH Short Bed Verified | 18470 | $824.21 2026-09-30 | fuel tanks/pump; 1973-1981; 2WD/4WD. 340 lph Phantom pump and sender pre-installed; MSRP 923.48; not CARB legal for 1973–1981 only, short bed Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| Holley (Sniper) Sniper EFI Fuel Tank System 255 LPH Verified 2WD | 19-156 | $849.95 2026-09-30 | fuel tanks/pump; 1982-1987; 2WD. 16 gal coated steel; 255 LPH pump; new straps incl; 6 ft bed; supports 550 EFI hp for 1982–1987 only, 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Buy | |
| Rock Valley Stainless Tanks 73-87 Chevy Underbed EFI Stainless Gas Tank Verified | — | $1,099.00 2026-09-30 | fuel tanks/pump; 1973-1987. 17 gal 304L stainless underbed tank; multiple Walbro pump configurations; straps incl; no mfr part number shown; sold out at open | Check price & fitment | |
| ICT Billet Fuel Pump Module 6AN 340 LPH (Silverado 73-91) Listed | QFS-H880-342-BC | $350 2026-09-29 | Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | In stock |
| ICT Billet Fuel Pump Module 6AN 535 LPH (Silverado 73-91) Listed | QFS-H880-295-BC | $500 2026-09-29 | Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | In stock |
| ICT Billet LS Swap Fuel Tank - 73-87 C10 Listed | TNK-TM11-A | $250 2026-09-29 | for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | Out of stock |
| Spectra Premium + Walbro '87 GM truck EFI tank + pickup + Walbro 255 LPH pump Listed | Walbro 5CA400HP | 1973-1987 trucks ('87 EFI tank retrofits all years) Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | RockAuto / parts stores | In production | |
| Spectra Premium GM1C fuel tank + FG05N sending unit Listed | GM1C / FG05N | 1973-1987 C10 for 2WD only | Buy | In production | |
| Wix Corvette fuel filter/regulator Community | 33737 | 1979 K20 4x4 LS swap (also used on C10s) for 1979–1979 only, 4WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | parts stores | In production | |
| AC Delco EP381 fuel pump in '87 K5 tank Community | 25163473 | 1973-1987 K-series / Blazer EFI tank retrofits for 4WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | parts stores | In production | |
| GM (junkyard) '87+ dual-tank selector valve (6-port, 75 psi rated) Listed | — | Dual-tank 1973-1987 trucks keeping both tanks Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | junkyard / '87+ donor | Used only | |
| BRP Hot Rods 1973-1987 GM Truck EFI fuel tank kit (255 LPH, 6ft or 8ft bed) Listed | — | $599.00 (255 LPH) / $669.00 (400 LPH) 2026-10-01 | 1973-1987 GM trucks, 6ft or 8ft bed | Direct from BRP Hot Rods | In production |
More notes for step 6Apply to the whole step, not one part
Measure before you buy1 note
- A PSI standalone swap needs only power, ground, a fuel pump able to support 58-psi (400 kPa) at the fuel rail, and an electric cooling fan.
Kit-specific notes17 notes
- Holley's 12-308 in-tank fuel pump module for 1973-1987 GM C/K series trucks flows 255 LPH and supports up to 550 horsepower.
- Aeromotive's Gen II Stealth fuel tank pump is a 200 lph unit, part number 11137.
- Aeromotive's 200 Stealth pump flows 215 LPH at 40 psi and 13.5 volts, drawing 8.3 amps at that pressure.
- Aeromotive's Gen II Stealth tank pump has a continuous operating pressure range of 3 psi to 65 psi with a carb or EFI bypass regulator.
- Aeromotive's Gen II Stealth pump has an internal bypass with a maximum deadhead pressure of 95 psi.
- Aeromotive directs using AN-06 (3/8-inch) hose on the supply and return lines of the Gen II Stealth tank.
- Aeromotive's Gen II Stealth tank uses an outlet cap with one male AN-6 supply and one male AN-6 return.
- Aeromotive's Gen II Stealth tank provides a 1/4-inch hose barb to be used with the factory vent.
- The secondary tank and selector valve can't be used with the Aeromotive Gen 2 Stealth tank; its flow is too high.
- Aeromotive's 340 Stealth pump used in the higher-flow tank is part number 11542.
- Aeromotive's Stealth 340 pump flows 340 LPH at 40 psi and 13.5 volts, drawing 13 amps at that pressure.
- Aeromotive requires a high-flow return-style regulator (13109, 13303-EFI, 13204, or 13304-carb) with the Stealth 340 pump.
- Don't use an OEM-style filter/regulator with the Aeromotive Stealth 340: it can't handle the flow, and the pump fails early.
- Aeromotive's Stealth tank uses a 0-90 ohm reading fuel level sending unit.
- Aeromotive requires 10-gauge fuel pump wiring triggered with a relay rated at a minimum of 20 amps.
- PSI's Gen 4 DBW harness includes accelerator pedal and throttle body connections; fan relays and fuse are available separately as KIT-1010.
- PSI's C10 swap pedal (ACC-1049) is a direct bolt-in pedal for 73-87 squarebody trucks, for GEN 3 only drive-by-wire applications ($115.00). (as listed 2026-09-30)
Everything else1 note
- All LS engines need 58–60 psi constant fuel pressure.
Why this step matters: 34 of 274 owner questions about this vehicle
- How do I wire the fuel pumps and selector valve on an LS-swapped dual-tank truck?
- How do I plumb dual factory fuel tanks for an LS swap cheaply while keeping both tanks?
- Do 87-91 square body tanks have baffles, and what pump goes in a TBI sending unit for an LS?
- Can I run an external frame-mounted fuel pump for a 5.3 swap instead of in-tank pumps?
- How do I plumb the fuel return on a dual-tank LS swap without causing tank overflow?
More: Fuel & E85 guide
Ready for the next step when you've decided return or returnless, and sized the pump and injectors for your power and fuel.
Next: wiring, computer & tune →7Wiring, computer & tuneHarness, computer and tune matched to the engine · 1 part
DecideA harness and computer that match your engine's crank signal (24x or 58x) and throttle (cable or drive-by-wire), and plan the tune, including VATS.
BuyFiTech Ultimate LS EFI 750HP system (intake, ECM, harness) $2,314.79Check price & fitmentHarness & computer (for standalone computer (replaces the factory computer and HP Tuners); includes the wiring harness) · alternatives in 7A
Must know
- Crank reluctor: 24x (black sensor) 1997–2006, 58x (gray sensor) 2006+; ECM/harness must match.
- The factory E38 or E67 controller cannot operate a cable throttle body, so a DBC conversion on a Gen IV engine must use a 411 PCM.
Harness & computer
16 options · $450–$2,314.79Why you need it: The computer and harness have to match the engine's crank signal (24x or 58x) and throttle (cable or drive-by-wire), and the tune has to turn VATS off. A reworked factory harness can keep a squarebody's A/C, cruise and gauges; cheap new harnesses often leave them out. More: 24x vs 58x, and which harness.
Our pick and alternativespick + 2 of 16
Our pick · for standalone computer (replaces the factory computer and HP Tuners); includes the wiring harnessFiTech Ultimate LS EFI 750HP system (intake, ECM, harness)71014 · Aftermarket alternative to stock ECM
$2,314.79 (2026-09-28)Check price & fitment
Speedway Motors 1999-2003 Vortec V8 Wiring HarnessUses engine's original ECM
$612.99Direct from Speedway Motors
Holley Terminator X Max Early Truck Engine MPFI Kit550-917 · If no OEM ECM or advanced needs
$1,698.95Direct from Holley
Compare 16 harness & computer options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| FiTech Ultimate LS EFI 750HP system (intake, ECM, harness) Verified Our pick | 71014 | $2,314.79 2026-09-28 | Aftermarket alternative to stock ECM | Check price & fitment | |
| Speedway Motors 1999-2003 Vortec V8 Wiring Harness Verified | — | $612.99 2026-09-28 | Uses engine's original ECM | Direct from Speedway Motors | |
| Holley Terminator X Max Early Truck Engine MPFI Kit Verified | 550-917 | $1,698.95 2026-09-28 | If no OEM ECM or advanced needs | Direct from Holley | |
| BP Automotive Gen III Drive By Wire 4L80E Standalone LS Swap Harness Multec Verified | H355 | price not listed 2026-09-30 | wiring harnesse; not stated; transmissions: 4L80E. For 03-07 4.8/5.3/6.0 LM4 L59 LM7 LQ4 LQ9 DBW Multec; universal standalone swap harness; 5 ft from intake; requires Blue/Green P59 PCM; off-road/pre-emissions Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| BP Automotive Vortec DBW Standalone Swap Harness T56 NonElectric Multec Verified | H354 | price not listed 2026-09-30 | wiring harnesse; not stated; transmissions: T56; TR6060. For 03-07 4.8/5.3/6.0 LM4 L59 LM7 LQ4 LQ9 DBW Multec; manual or non-electric trans; incl reverse lockout solenoid and speed sensor wiring; requires Blue/Green P59 PCM Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| BP Automotive LS Swap Harness DBW Vortec 4L60E Verified | H353 | $550.00 2026-09-30 | wiring harnesse; not stated; transmissions: 4L60E. BTR product page titles it BP Automotive DBW Vortec 4L60E H353 and shows 550.00; manufacturer description: DBW Multec for 03-07 4.8/5.3/6.0 LM4 L59 LM7 LQ4 LQ9; ships from manufacturer; sold by Brian Tooley Racing Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| BP Automotive Gen III DBC Standalone Harness w/ 4L60e Multec Verified | H303 | $550.00 2026-09-30 | wiring harnesse; not stated; transmissions: 4L60E. BTR page: BP Automotive DBC 4L60e harness; 24x; Multec II injectors; for 1999-2006 4.8/5.3/6.0 LM4 LM7 LQ4 LQ9; in stock; sold by Brian Tooley Racing Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| BP Automotive Gen III DBC Standalone Harness w/ 4L80e Multec Verified | H305 | $550.00 2026-09-30 | wiring harnesse; not stated; transmissions: 4L80E. BTR page: BP Automotive DBC 4L80e harness; 24x; Multec injectors; for 1999-2007 4.8/5.3/6.0 LR4 LM7 L59 LM4 LQ4 LQ9; ships from manufacturer; sold by Brian Tooley Racing Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| BP Automotive 99-06 Vortec DBC Standalone Harness T56 or Non Electric Multec Injectors Verified | H304 | $550.00 2026-09-30 | wiring harnesse; 1999-06 (engine); transmissions: T56; manual or non-electric transmission; not for: 4L60E; 4L80E. BP Automotive harness for 99-06 4.8 5.3 6.0 LM4 LM7 LQ4 LQ9 with drive by cable throttle and Multec injectors; 24x; sold by Brian Tooley Racing; item on backorder at time of observation Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| Holley Terminator X 58x GM LS Engine Harness ECU Kit EV6 Verified | 550-905 | $1,599.95 2026-09-30 | wiring harnesse; not stated; transmissions: manual (non-electric). Terminator X ECU plus 58x/4x main harness EV6 injector harness; DBC; wideband controller data logger; no trans controller; for Gen III/IV LS 4.8-6.2 Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| Holley Terminator X Max (ECU + transmission control) Listed | — | LS + 4L60E/4L80E combos in 1973-1987 C10 for 2WD only | Holley / retailers | In production | |
| Aces Fuel Injection Jackpot LS ECU kit Listed | — | 1973-1987 C10 LS swaps for 2WD only | Direct from Aces Fuel Injection | In production | |
| BP Automotive Standalone LS swap harness Listed | H101 | 1973-1987 C10 LS swaps for 2WD only | Check price & fitment | In production | |
| Lone Star Dyno (harness rework) Reworked/converted OE harness, keeps A/C, cruise, gauges Listed | — | $450-$650 reworked; $1000+ new 2015 (Tejas guide) | 1973-1987 C10; builder needs to know which features to keep for 2WD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | lonestardyno / pro harness builder | Small batch |
| Tuner (local) Dyno tune after swap (beyond base tune) Listed | — | ~$500 2015 (Tejas guide) | Any 1973-1987 LS swap Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | local dyno tuner | DIY |
| PSI Conversion Standalone LS swap harness Listed | HAR-1066 | $875.00 2026-10-01 | 1973-1987 C10 LS swaps for 2WD only | Check price & fitment | In production |
New Already have a tune in it? Send us the file for a free Tune Report: what to fix first, in plain English, within 1 business day. See what you get →
More notes for step 7Apply to the whole step, not one part
Measure before you buy1 note
- Painless builds its LS harnesses with high-grade TXL automotive wire, pre-terminated connectors, and clear circuit labeling for plug-and-play installation.
Kit-specific notes5 notes
- The US Shift Quick 4 GM package includes both the early-style (large) and late-style (small) output shaft speed sensor connector harnesses.
- Painless instructs routing vehicle speed sensor wires at least 12 inches away from any ignition wiring.
- Holley's 558-417 DBW harness is made for compatibility with the 0486 1708 pedal assembly, while the 558-418 harness pairs with the 0486 1714 pedal.
- Holley DBW harnesses cannot be cut, shortened, lengthened, tailored, or modified under any circumstance.
- Only the 0459 1847 factory drive-by-wire throttle body has been precalibrated and approved for use with Holley's 558-417/558-418 DBW harnesses.
Everything else4 notes
- US Shift lists the Quick 4 with wiring kit at $985. (as listed 2026-09-30)
- Every Speartech harness ships with instructions, every wire labeled, and an OBD2 port with an integrated check engine light.
- Speartech's standard order lead time for standalone harnesses is 4-5 weeks for Gen 3 or Gen 4 applications.
- Painless Performance LS standalone harnesses support 4.8L, 5.3L, 6.0L, 6.2L, LS1, LS2, LS3, and LS6 engines in both drive-by-wire and drive-by-cable setups while retaining the factory GM ECU.
Why this step matters: 50 of 274 owner questions about this vehicle
- Why does the LS ECU need a VSS signal if I keep my old mechanical-speedo transmission?
- How do I get a speedometer working with a 4L65E/NP241C in a square body?
- My LS swap alternator light won't illuminate and the alternator gets warm with the key off — wiring or bad alternator?
- How do I wire up the bulkhead connector when LS-swapping a 76 K10?
- How do I hook a reworked 5.3 harness into the ignition switch wiring?
More: ECU comparison · Tuning
Ready for the next step when the harness and computer match your engine's crank signal and throttle, and you have a plan for the tune.
Next: cost →8CostThe whole budget, not just the engine
DecideA full budget, not just the engine: mounts, pan, accessories, fuel, wiring, tune and labor add up.
More notes for step 8Apply to the whole step, not one part
Everything else1 note
- Adapting a 4LXX to the old transfer case costs ~$750–900 in kits and needs the tailshaft/housing removed.
Answered for this vehicle2 answers
Why this step matters: 6 of 274 owner questions about this vehicle
- Should I rebuild the 350 or do an LS swap in my square body, and what does an LS swap really cost?
- What does an LS swap into a square body actually cost, and what are the main line items?
- What parts and budget should I plan for an LS engine/trans swap in a squarebody?
- What is the cheapest V8 swap for a 1986 C10 on a $3k budget?
- What MPG can I realistically expect from an LS swap, and is a 4.8L a smart budget donor?
That's the last step. Put your picks together in the planner.
Plan your exact combination →Swap kits sold for this vehicle
Why it matters: the kit's mounts decide where the engine sits, and that decides oil pan, header and crossmember clearance. Confirm the kit lists your exact years. More: engine mounts and swap kits.
Questions about this swap
- How much does it cost to LS swap a C10?
- How to LS swap a C10: parts list and steps
- How much does it cost to LS swap a square body?
- What fuel tank, pump, and line setup works for an LS swap in a 1972 C10?
- How do I make a 700R4 survive behind an LS in a square body?
- Should I rebuild the 350 or do an LS swap in my square body, and what does an LS swap really cost?
- Where do I route the LS steam vent line on a square body swap?
- Which LS oil pan clears the crossmember on a lowered 67 C10 without hanging too low?
- Can an aftermarket under-bed gas tank work for an LS swap in a 72 C10?
- How do I find a driveshaft that fits a 5.3/4L60E LS swap in a 60s C10?
- What is needed to bolt a TH400 to an LS engine and get a VSS signal to the PCM in a C10?
- Can an LS swap into a 71 C10 be done cheaply with a carburetor and manual transmission, and what parts does it take?
Every LS swap also needs
An oil pan that clears
Compare GM LS pans by sump position and depth.
Accessory drive spacing
F-body, car, truck and Corvette offsets.
Fuel system sizing
Injector and pump sizing for your power goal.
A harness, computer and tune
VATS delete, 24x vs 58x, drive-by-wire, harness makers.
A transmission
4L60E to 8HP70 behind an LS.