What electric fan setup works best on these trucks, and what radiator/fan combinations are compatible?

Start by measuring the radiator core you're actually running. Fan size and shroud depend on core height and width, which differ between classic and universal radiators.

Pusher vs puller: a puller (between radiator and engine) is preferred — it's more efficient and it's what most OEMs use. Use a pusher (in front of the radiator) when there isn't room behind it, or to add airflow to an A/C condenser or cooler.

Single vs dual fans:

	Single fan	Dual fans
Pros	Simpler, fewer relays, saves space, lower amp draw	More airflow (high hp, A/C, heavy duty), staged operation, a backup if one fails
Cons	May not cover a large core without a shroud; no backup	Takes more space, needs a strong charging system and a relay/fuse per fan or a dual-fan controller, more wiring

Blade style: straight blades move a lot of air but are louder; curved "S" blades are quieter and are what most modern fans use.

Radiator + fan packages: direct-fit LS radiators (Afco, DeWitts, Frostbite) often let you pick a shroud with a single large fan or dual smaller fans. Speedway notes a big single fan may cover a square-ish core better, but its deepest point can end up closest to the engine, so check clearance.