IDENTIFICATION
All transmissions have a metal identification plate attached to rear face of transmission case. (Scheme 2)
Scheme 2
DESCRIPTION
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 torque converter. Transmission uses a gear-type oil 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. (Scheme 3)
Hydra-Matic 4L80-E also uses 2 electronic shift solenoids controlled by Powertrain Control Module (PCM) or Transmission Control Module (TCM). Transmission uses a electronic speed sensor(s) instead of a mechanical governor.
