This is probably one of the best, if not the best three speed transmissions ever designed by any manufacturer. Very simple, heavy duty and there are plenty of parts out there to modify them.
-
BET Performance Turbo 375B 400 3L80 4L80E 4L85E Rear Geartrain Install Tool -
This Turbo Hydra Matic 4L80E 4L85E Air Check Test Plate is compatible with all 4L80E and 4L85E GM transmissions
