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I have been fighting this problem ever since I bought the truck. It vibrates the worst when the glass is all the way up but it will do it when it's down also. I have replaced the striker bushings, adjusted the latches and hinges at least a hundred times, completely disassembled and cleaned window regulator twice, added foam tape around the access panel. But still vibrates, I'm about to go get a whole new tailgate.
What year?
My '82 does similar but not as bad maybe.
All I have noticed is that the window in the down position moves around quite a bit.
When the window is up there is not much support either. So maybe the motor arms are loose?
My 88 squeaks really bad too. I have found out that if I let the window down an inch or so it will stop. The problem was that the weather striping was old and hard. I just put some stick on striping on there and it stoped.
It's more of a rattle then a squeak. It's like something's lose inside the tailgate. I even drove around without the glass in the there and it still rattled.
Check out the bolts and hinges under the tailgate. This is what causes mine to make that noise. A good way to check them is when the tailgate is down grap where the tailgate meets the body and try to move it up and down. If there is movement that is where your problem might be.
I HAD the same problem with my 93 XLT. I found it was the arm that releases the hinges. It was hitting against the glass and the sheet metal around the window. I cut a piece of small hose and cable tied it to the arm. NO more rattle.
I finally stumbled on the cause of the problem; it was the torsion bar in the bottom of the tailgate. I stuffed some foam padding around it and so far it has worked. Thanks for trying to help guys.
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