GM Service Manual Online
For 1990-2009 cars only

Forward Motion in Neutral

Checks

Cause

Manual Valve (319)

Valve is mispositioned or stuck

Forward Clutch Springs (607)

Jammed

Forward Clutch Piston (606)

Jammed

Forward Clutch Plates (610, 611)

Seized or jammed

Forward Clutch Housing (602)

The hole is plugged

Hub (613)

The holes are plugged