Hi guys I have a 2k1 2wd that squek whenever i shift into reverse... any help would be greatly appreciated.. I have changed the rear brakes so now i'm at a lost

 

I had the same problem not long ago it started as a rotational squeak whenever I was in reverse. Then it got worse then started doing it in drive. Upon having it checked out it ended up being a u-joint gone bad (stock sealed and non greaseable) I had it replaced $97 parts and labor now squeak is gone