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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transaxle - 4T80-E - Introduction (2 Of 2)) >> Description and Operation >> Automatic Transmission Hydraulic Diagrams >> Manual First Gear >> Second Clutch Releases

Second Clutch Releases

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1-2 Shift Valve 

High 1-2 solenoid fluid pressure holds the 1-2 shift valve in the downshifted position. The valve allows second clutch fluid from the second clutch piston and from the 1-2 accumulator piston to pass through the valve and to exhaust.

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