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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (Automatic Transaxle - 4T65-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Description And Operation >> Automatic Transmission Hydraulic Diagrams >> Overdrive Range, First Gear (With Touch Activated Power) >> Number 6 Ball Check Valve (372)

Number 6 Ball Check Valve (372)

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Located in the control valve body (300), blocks forward servo apply passage forcing D4 pressure to the forward servo boost valve (367), the forward servo feed orifice on the spacer plate (370). When the manual valve (404) is moved from DRIVE to PARK or NEUTRAL, the ball check valve unseats to allow for a quick exhaust of servo apply fluid and release of the forward band assembly (688).