DESCRIPTION & OPERATION
Hydra-Matic 4T65-E is a fully automatic front wheel drive electronically controlled transaxle. Four forward ranges including overdrive are provided. Powertrain Control Module (PCM) controls shift points using two shift solenoids. A vane-type oil pump supplies oil pressure. PCM regulates oil pressure using pressure control solenoid valve. All vehicles equipped with 4T65-E transaxle have an Electronically Controlled Capacity Clutch (ECCC) system. In ECCC system, pressure plate does not fully lock to torque converter cover. It is precisely controlled to maintain a small amount of slippage between engine and turbine, reducing driveline torsional disturbances.
Multiplied torque from torque converter is transferred to transaxle by a sprocket and drive chain (drive link) assembly. Other internal components consist of 4 multiple-disc clutches, roller clutch, sprag clutch, 3 bands and compound planetary gear set. Final drive gear and differential assemblies are an integral part of transaxle. (Scheme 3)- (Scheme 9).
Note. Drive chain may also be referred to as "drive link".
