GM Service Manual Online
For 1990-2009 cars only

No 2-3 Shift

Checks

Cause

Control Valve Assembly

    • Stuck 2-3 shift valve
    • Stuck 3-2 manual downshift valve

Channel Plate Gasket

Mispositioned or damaged

Driven Sprocket Support

Blocked Third clutch passage

Input Housing and Shaft Assembly

    • Damaged seals
    • Blocked oil passages

Third Clutch Assembly

    • Burned clutch plates
    • Damaged piston or seals
    • Damaged checkball assembly in the piston

Third Roller Clutch Assembly

    • Damaged cage
    • Rollers out of the cage
    • Damaged springs
    • Misassembled input sun gear shaft
    • No third gear in Manual Lo
    • No engine braking in Manual Lo