For 1990-2009 cars

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