Not the gear box fault. You must remove all the old dried grease on tracks and replace with a non hardening grease. Gear boxes should last another 50 years.
Thank you,
Gary, the parts doc
Escondido, CA USA
Land of the Avocado
Mail: garythepartsdoc@xxxxxxxxxxxx
760.751.1958
Terry McTaggart here. Over the last few years, I have experianced two failures in the power window gearboxes in my 300F. Both failures were identical, in that the plastic gear teeth surrounding the metal disk inside the gearbox broke, rendering the gearbox useless. Fortunately I had two spares in the attic and was able to replace the offending part. Now, however, I have no more spares and the next failure (if there is one) will be a major problem. Has anyone else experienced this failure, and if so, might this be a good project for the repro committee?