IDENTIFICATION
All transmissions have a metal identification plate attached to the rear face of transmission case. (Scheme 34)
Scheme 34
DESCRIPTION
The Hydra-Matic 4L80-E transmission is a fully automatic 4-speed unit consisting primarily of a hydraulic torque converter and converter clutch. Transmissions have dual stators inside the torque converter. Transmission uses a gear-type pump to supply all hydraulic pressure needed for operation.
Other internal parts include the following: 5 multiple disc clutches, a roller clutch, a sprag clutch, 2 bands and 3 compound planetary gear sets.
The Hydra-Matic 4L80-E also uses 2 electronic shift solenoids controlled by Powertrain Control Module (PCM) or Transmission Control Module (TCM). The transmission uses 2 speed sensors instead of a governor.