| Subject: | No Forward or Reverse After Valve Body and/or Spacer Plate Replacement |
| Models: | 2006-2007 Cadillac STS-V, XLR-V |
| 2007 Cadillac Escalade, Escalade ESV, Escalade EXT |
| 2006-2007 Chevrolet Corvette |
| 2007 GMC Yukon Denali, Yukon XL Denali |
| equipped with 6L50 (MYB) or 6L80 (MYC) Automatic Transmission |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
After replacement of the valve body and/or spacer plate the transmission may have a no forward or reverse condition.
Recommendation/Instructions:
This condition may occur if any type of grease or petroleum jelly is used to hold the valve body check balls in place. This grease may prevent the check balls from working properly causing a no forward or reverse condition
When assembling the valve body do not use any type of grease or other material, including petroleum jelly and jells sold for transmission assembly usage. These materials may prevent proper operation of the check balls
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
