I searched and didn't find a repair section for the power windows, so here goes
When we bought the latest 83' Fifth Avenue in December I noticed the driver's side rear window needed help to roll up. That is to say, if you didn't grab it and pull up, to help the motor, it wasn't going to go all the way up.
I knew the fix from previous Fifth Avenue and Fords (which use the exact same repair part by the way);

I pulled off the inner door panel and undid the three 3/8" bolts and unplugged the motor and removed it. Once I opened it up on the bench I noticed the three roll pins were no where to be seen;


That's what a used roll pin looks like. Pulled three out of an extra wrong side window motor I had.
Here's the three used pins loaded up with synthetic wheel bearing grease and about to go back together. Did it work ? Like a charm. Got to love the no cost repairs.

Takes no time at all
Malcolm