I used to own a GM, so I know all about rattle/squeak fixes. Trace it down to it's source.. say RF door panel. Find exactly how it's making the noise. I liked taking the door panel off and using some felt stick on stuff where the "contact" area was for the sqeak. I'm proud to say I only have 1 rattle/squeak in my '94runner and it's in the RF door panel. on the upper part by the sill. the vinyl or whatever is rubbing the painted part of the door. So When I replace my door speakers here next week I'll be putting the stick on felt on that area. Good luck. I know I hate these little annoying things too.