I repaired my rear window motor by opening it up, cleaning out the crunched up bits of plastic, and replacing the bushings with 1/4" nuts. Works better than ever.
1981 Ford Bronco. 300I6 Offenhauser DP Intake, QuickFuel 450cfm 4bbl, 32" BFG A/T KO2, NP-435, 3.00 rear 9" EFI Manifolds. 2.5" high flow cat/muffler. DUI ignition.