4L80-E Automatic Transmission

This model is a fully automatic rear wheel drive electronically controlled transmission. Its major components consist of a 3-element torque converter, including a [1][2]torque converter clutch and dual stators, three planetary gear sets and five multiple disc type clutches. Oil pressure is from a gear type oil pump and regulated by a force motor solenoid.

Shift points are controlled by the vehicle's computer and are based on throttle angle and vehicle speed. When the computer says a shift should occur, an electrical signal is sent to the shift solenoids which in turn move the valves to perform the shift.