General Description

The 4R44E/4R55E automatic (rear wheel drive) transmissions are four-speed units with electronic shift controls.

The 4R44E transmission is used with 2.3L and 3.0L engine applications. The 4R55E transmission is used with 4.0L engine applications.

These transmissions feature a four-element torque converter including TCC (Torque Converter Clutch). The geartrain includes:

^ Three compound planetary gearsets
^ Three bands
^ Three multi-plate clutches
^ Two one-way clutches

The hydraulic functions are directed by electronic solenoids to control:

^ Engagement feel
^ Shift feel
^ Shift scheduling
^ Modulated TCC applications
^ Timing of the 3-2 T.D. and K.D. shifts
^ Engine braking (with O/D cancelled) utilizing the Coast Clutch
^ Manual 1st timing
^ Thermostat bypass and cooler limit