1985 5th Ave power window issue

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Jun 19, 2015
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I have a 1985 5th Avenue that has a power window issue.
This vehicle only has 109,000 miles on it.
The small steel gear on the motor has the teeth (which engages the regulator) strip off in a very short time.
I have replaced that gear 3 times now and it still is happening.
Without the gear connected to the regulator the window moves up and down by hand without binding. I have removed the regulator but can not find anything wrong.
I drilled the pop rivets which hold the motor to the door panel and re-installed using new bolts to secure it.
What could I do to fix this ongoing problem?
If it might be the regulator, where can a replacement be purchased.
Thank you for your assistance.
 
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