GM Service Manual Online
For 1990-2009 cars only

No 3-4 Shift

Checks

Cause

Control Valve Assembly

    • Stuck 3-4 shift valve
    • Stuck 4-3 manual downshift valve

Fourth Clutch Shaft

Damaged spline

Fourth Clutch Assembly

    • Burned clutch plates
    • Damaged piston or seals
    • Mislocated clutch plates or piston

Shift Cable

Adjust the shift cable