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Home >> Buick >> 2009 >> Allure CX >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transmission - 4T65-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis >> Description And Operation >> Automatic Transmission Hydraulic Diagrams >> Drive Range, Manual Third (from Overdrive Range) >> Number 3 Ball Check Valve (372)

Number 3 Ball Check Valve (372)

Located in the case cover (400), it is seated against the PRN passage allowing input clutch fluid to apply the input clutch.