GM Service Manual Online
For 1990-2009 cars only

First Gear Only

Checks

Cause

Control Valve Assembly

    â€¢ Stuck or binding 1-2 Shift valve
    â€¢ Mispositioned or damaged space plate or gaskets

Driven Sprocket Support

Damaged oil seals

Second Clutch Assembly

    â€¢ Damaged clutch plates
    â€¢ Damaged piston or seals
    â€¢ Misassembled parts

Reverse Reaction Drum

Damaged splines