DESCRIPTION & OPERATION
Hydra-Matic 4L80-E transmission is a fully automatic 4-speed unit consisting primarily of a hydraulic torque converter and torque converter clutch. Transmission uses a gear-type oil pump to supply all hydraulic pressure needed for operation. Other internal components include 5 multiple disc clutches, 2 roller clutches, a sprag clutch, 2 bands, 2 speed sensors and 3 compound planetary gear sets.
Hydra-Matic 4L80-E also uses 2 electronic shift solenoids. Shift solenoids are controlled by Powertrain Control Module (PCM), Transmission Control Module (TCM), or Vehicle Control Module (VCM), depending on vehicle model and engine application.
Note. Unless specified otherwise, references to "control module" throughout this article refer to PCM, TCM or VCM, depending on application.