Harsh Park to Reverse/Drive Engagement
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Harsh Park to Reverse/Drive Engagement
| Checks | Cause |
|---|---|
| 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. | |
| Transmission Main Line Pressure | High transmission main line pressure |
| Reverse Band Servo Assembly - Reverse engagement only | The reverse band servo piston cushion spring (45) is broken or is missing. |
| Forward Band Servo Assembly - Drive engagement only | The forward band servo piston cushion spring (19) is broken or is missing. |
| Transmission Case Cover Ball Check Valve - Reverse engagement only | The #5 Ball check valve (372) is mislocated or is missing. |
| Transmission Case Cover Ball Check Valve - Drive engagement only | The #6 Ball check valve (372) is mislocated or is missing. |
| Control Valve Body Assembly - Reverse engagement only | The reverse servo boost valve (367A) is binding or is damaged. |
| Control Valve Body Assembly - Drive engagement only | The forward servo boost valve (367B) is binding or is damaged. |
| Control Valve Body Spacer Plate Assembly - Drive engagement only | The thermal element is damaged or is not functioning properly. |