How do you firm up shifts on a 4L60E with HP Tuners?
In the tune: HP Tuners' introduction to transmission tuning names line pressure (higher = firmer), desired shift time (shorter = quicker) and torque management (less reduction during the shift) as the controls for shift feel.
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Mechanically: Holley's shift-kit instructions note that on a PCM-controlled 4L60E a shift kit firms shifts without changing the PCM's shift points or pressure calibration. Some people do both.
Caution: Changing or disabling torque-management values can shorten transmission life. Firm up in steps, and reset the adapts after big changes. See transmission tuning.
Want to do it yourself? See who tunes it, and how to learn.
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