The Hydra-matic 6T70/75 (6 Speed) is a fully automatic, six speed, front wheel drive, electronically controlled transmission that features clutch to clutch shifting. It is also all-wheel drive capable. It was first introduced in the 2007 model year in several different models. It consists primarily of a four element torque converter, three planetary gear sets, five clutch packs, one mechanical one-way clutch and a hydraulic pressurization and control system. Three planetary gear sets provide the six forward gear ratios and reverse. Changing gear ratios is fully automatic and is accomplished through the use of a Transmission Control Module (TCM), that is located within the transmission. The TCM receives and monitors various electronic sensor inputs, and uses this information to shift the transmission at the optimum time. The TCM commands shift solenoids and variable bleed Clutch Pressure Control (CPC) solenoids within the transmission to control shift timing. The TCM controls shift feel through the CPC solenoids. The TCM also controls the apply and release of the torque converter clutch which allows the engine to deliver the maximum fuel efficiency without sacrificing vehicle performance. This ATSG 6T70/75 Technical Manual contains the procedures necessary to diagnose, overhaul and/or repair the 6T70/75 (6 Speed) transmission from General Motors.

Contents:

• General Description and Vehicle Application Chart
• Component Location and Identification
• Component Application Chart
• Shift Quadrants
• Identification Tag Information, Fluid Requirements
• Torque Converter Clutch Operation
• Electronic Component Operation
• Solenoid Application Chart
• Solenoid Description and Operation
• Internal Mode Switch Operation
• Input Speed Sensor
• Output Speed Sensor
• Typical Wire Schematic
• Diagnostic Trouble Code Description
• Connectors and Terminal Identification
• Low One-Way "Diode Style" Clutch Description
• Hydralic Passage Identification
• Checkball Location and Function
• Transmission Disassembly
• Component Rebuild Section
• Transmission Final Assembly
• Low One-Way Freewheel Direction
• Thrust Bearing and Thrust Washer Identification
• Torque Specifcation
• Special Tools
• Line Pressure Check
• Fluid Level Check and Fluid Requirement
• Flare Shift into 4th, 5th or 6th Hot
• Pressure Tap Location and Specifications

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