18277 - Customer Satisfaction Program - Certain vehicles equipped with RPO MNH (6 Speed Automatic Transmission) may have been built without a transmission case assembly cup plug. As a result, lubrication flow within the transmission may be compromised, and the transmission will wear prematurely. The customer may notice noise coming from the transmission area, or rough or irregular shifting. If the customer continues to drive the vehicle for an extended period after noticing these signs of wear, transmission failure may occur, resulting in a loss of propulsion. Replace Transmission.