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So, I basically just popped out the better condition gears from the rear motor and put them into the front window motor and then swapped in the old worn and stripped gears into the rear window motor.
Here's a picture of the front motor with the "new" rear motor gears in place, dust cap read to reinstall.
After swapping gears, the rear motor with the bad gears was reinstalled and the door put back together with the window in the up position. Power to the motor was disconnected, so I don't accidently roll it down and all is good. I never roll down that window anyway, so it's no problem.
The new "rebuilt" motor was reinstalled in the front door and the tracks were readjusted to factory specs. The window runs were thoroughly cleaned and lubed and now the whole thing works perfectly.
I plan to replace the runs as soon as I can order a set from C-dan, since they were probably a major cause of the failure.
However, one major lesson learned here is that the window gear mechanism in all these 80 series windows that are slow or stop working is probably the major culprit. I've read mention of the gear being loose and folks wondering if that was normal. That answer is no, it's not normal at all. The gear should be rock solid. It's loose, because the gear shaft is worn and/or the C-clip has come loose.
The best thing about this fix is that it didn't cost me a dime and my front window works good as new!
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