GM Service Manual Online
For 1990-2009 cars only

First Gear Only

Checks

Cause

Control Valve Assembly

    • Stuck or binding 1-2 Shift valve
    • Mispositioned or damaged space plate or gaskets

Driven Sprocket Support

Damaged oil seals

Second Clutch Assembly

    • Damaged clutch plates
    • Damaged piston or seals
    • Misassembled parts

Reverse Reaction Drum

Damaged splines