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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, Fourth Gear - Torque Converter Clutch Not Applied >> 1-2 Shift Valve (318)

1-2 Shift Valve (318)

Is held against 1-2, 3-4 signal fluid pressure by spring pressure and 2-3 off signal fluid pressure at the end of the valve.