window movement after motor replacement
The window attaches to the regulator on rolling guides. It is possible that one of these rolling guides has separated from the regulator causing the binding and the front to back tilting motion.
You will see the regulator and the channel in which these rollers move. Check the rollers along the full length of the window. Make sure they are all still inside the channel. Make sure the regulator gear is still meshed with the window motor gear.
Even new motors fail but since you mentioned binding, tilting and now lack of operation since the accident, I'm leaning towards a bind in the regulator arms or one of the rollers have slipped out of the channel. Good luck with this.
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Did you adjust these pieces when you did your original motor replacement? Does the window behave differently when the door is open vs. shut? Does the rocking back and forth problem only happen at that 3" point?
I've had the back and forth problem with my windows as well. If just one of your top felt pads is pressing more than it should, you'll get this action. Lubricating the tracks and rollers with Syl-Glide (you can get it at Napa) may also help and the problem should work itself out once the door is adjusted properly.
BTW - If you are going to take out the regulator, I'd suggest getting detailed instructions first if you aren't familiar with the procedure. The regulator is loaded with a very powerful spring and will do bad things if you take it apart without the right precautions.
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