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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 >> Fourth Band Releases

Fourth Band Releases

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1-2 Shift Valve 

High fluid pressure from the 1-2 shift solenoid (SS) valve holds the 1-2 shift valve in the downshifted position. The valve allows fourth band fluid from the fourth servo and from the 3-4 accumulator piston to pass through the valve. Fourth band fluid then enters an exhaust passage where the fluid is routed through orifice #2 before exiting the circuit.

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