Harsh Park to Reverse/Drive Engagement
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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. |