My sunroof had a stripped nylon gear in the slip clutch assembly. I think the previous owner tightened it up quite a bit to keep it from slipping (the purpose of the thing) and it didn't last long. The motor was good.

The dealer couldn't sell me the gear, and wanted hundreds for a new motor. I found a 126 motor, which was somehow backwards from the one I had, removed the nylon gear, rebuilt what I had, and life is good. About a $25 repair.

Ben