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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 >> Overdrive Range, Third Gear - Torque Converter Clutch Not Applied >> Number 4 Ball Check Valve (372)

Number 4 Ball Check Valve (372)

Located in the case cover (400), directs 3rd clutch fluid into the 3rd clutch/lo-1st passage to apply the 3rd clutch.