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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 246 (Automatic Transaxle - 4T65-E - Overhaul) >> Description and Operation >> Automatic Transmission Hydraulic Diagrams >> Manual First Gear (With Touch Activated Power) >> Number 4 Ball Check Valve (372)

Number 4 Ball Check Valve (372)

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Located in the case cover (400), it seats against 3rd clutch fluid allowing low reg fluid to enter the 3rd clutch/lo-1st fluid passage and apply the 3rd clutch.