This information applies to 2006-07 Cadillac STS-V, XLR-V, Chevrolet Corvette, 2007 Cadillac Escalade, STS, SRX, GMC Yukon equipped with 6L50 (MYB) or 6L80 (MYC) Automatic Transmission.

After replacement of the valve body and/or spacer plate, the transmission may have a no forward or reverse condition.

This 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.

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.

The transmission will not build enough heat initially to melt the lubricant, which can cause a DTC and range inhibit. Also, the valve body is assembled on the bench. There are no check balls between the body and transmission case, so no assembly lube should be necessary.