Automatic Transaxle Overhaul & Testing - 4T65-E: Description

Hydra-Matic 4T65-E transaxle is a fully automatic 4-speed unit consisting primarily of a 3-element hydraulic torque converter and converter clutch. Transaxle uses a variable capacity vane-type oil pump to supply all hydraulic pressure needed for operation.

Multiplied torque from torque converter is transferred to transaxle by a sprocket and drive link chain assembly. Other internal components consist of 4 multiple-disc clutches, a roller clutch, a sprag clutch, 3 bands and a compound planetary gear set. Final drive gear and differential assemblies are an integral part of transaxle.

Transaxle uses electronic shift solenoids, controlled by the Powertrain Control Module (PCM), to switch hydraulic pressure on or off. Another electronic solenoid controls Torque Converter Clutch (TCC) lock up. A Pulse Width Modulated (PWM) solenoid is used to control rate of TCC apply.