I pulled my 90 Bronco window last week-end. http://www.Off-Road.Com/ford/bigbron...indow-fix.html has some good info.
my outside window seal is trash, thus the bottom of the tail gate is rusted out as well as "C" channel and regulator assembly.
Gravel roads covered the "C" channel with lots of gunk, and also the regulator assembly was good and rusted. I cleaned the arms/gears
of the regulator assembly with a wire brush on my dewalt, put a light coat of paint on them, and greased the gears. If your using the same
"C" channels again ( i can't broke 3 out of 4 bolts while removing window ) the book i have recommends cleaning and loobing the
"C" channel. If the "C" channel and the regulator arms are binding, i would guess that the motor is getting a lot of strain thus causing
your slow operation. Good luck
Hawg, If you can stop the window from going up with your hand, and the motor is still running, then those pins in the drive gear probably broke. The output will be real wimpy, and greasing a track may look like it cures the problem, but it will re-appear. There's a simple fix, do a search for "nylon spacer".