GM Service Manual Online
For 1990-2009 cars only

Check

Causes

DEFINITION: Gear engagement that is harsh when the engine is idling in Park or Neutral, and the gear selector is moved to Drive or Reverse range.

Forward Clutch

    • · Damaged or worn piston (436)
    • · Damaged or worn clutch plates (449)
    • · Damaged or stuck ball check valve (434)

Reverse Clutch

    • · Damaged or worn piston (404)
    • · Damaged or worn clutch plates (418/417)
    • · Damaged or stuck ball check valve (403)

Fluid Pump Assembly

Refer to Harsh Shift 4 to 5, or 5 to 4.

PC Solenoid

Damaged