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ASTS 6T70 / 6T75 (6 Speed) Hydra-matic Transmission Repair Manual
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ASTS 6T70 / 6T75 (6 Speed) Hydra-matic Transmission Repair Manual

Part #: 124400
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The new 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, as shown in Figure 1. 

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 manual contains the procedures necessary to diagnose, overhaul and/or repair the new 6T70/75 (6 Speed) transmission from General Motors.