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Home › Pontiac › 2001 › Aztek Base, AWD › Repair and Diagnosis › Transmission › Automatic Trans › Automatic Transaxle Overhaul & Testing - 4T65-E › Description & Operation

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. See Fig 1-Fig 7 .

NOTE: Drive chain may also be referred to as "drive link".
Fig 1: Identifying Hydra-Matic 4T65-E Transaxle Component Locations
G98A01962Courtesy of GENERAL MOTORS CORP.
Fig 2: Exploded View Of Case Side Cover Components
G98D01973Courtesy of GENERAL MOTORS CORP.
Fig 3: Exploded View Of Transaxle Case Components
G98H01965Courtesy of GENERAL MOTORS CORP.
Fig 4: Exploded View Of 4th Clutch, Turbine Shaft, Output Shaft, & Drive & Driven Sprocket Assembly Components
G00057583Courtesy of GENERAL MOTORS CORP.
Fig 5: Exploded View Of Transaxle Internal Components (1 Of 2)
G98E01983Courtesy of GENERAL MOTORS CORP.
Fig 6: Exploded View Of Transaxle Internal Components (2 Of 2)
G98G01984Courtesy of GENERAL MOTORS CORP.
Fig 7: Exploded View Of Parking System Components
G99B54982Courtesy of GENERAL MOTORS CORP.
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