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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transmission - 6T70 - Description And Operation >> Description and Operation >> Drive Range, Sixth Gear >> 3-5 Clutch Releases

3-5 Clutch Releases

3-5-R Pressure Control Solenoid 2 

The 3-5-R pressure control Solenoid 2 is commanded OFF, allowing PCS 3-5-Reverse clutch fluid from the 3-5 reverse clutch boost valve and the 3-5 reverse clutch regulator valve to exhaust through the solenoid.

3-5 Reverse Clutch Boost Valve 

The 3-5 reverse boost valve spring force moves the valve to allow 3-5-Reverse clutch feedback fluid from the 3-5 reverse clutch regulator valve to enter the 3-5-Reverse clutch circuit and exhaust.

3-5 Reverse Clutch Regulator Valve 

The 3-5 reverse clutch regulator valve spring force moves the valve to allow actuator feed limit fluid to pass through the valve and enter the PS 2 fluid circuit which opens PS 2. The 3-5-Reverse clutch fluid then enters the exhaust backfill fluid circuit and is routed through orifice #30 to the exhaust backfill pressure relief valve where excess pressure is exhausted.

3-5 Reverse Clutch 

The 3-5 reverse clutch spring force moves the 3-5 reverse clutch piston to release the 3-5 clutch plates and forces 3-5 reverse clutch fluid to exhaust from 3-5 reverse/4-5-6 Clutch housing. The 3-5 reverse clutch fluid is then routed to the 3-5 reverse clutch regulator valve where it exhaust excess pressure.