i have an 83 jimmy and it has a sorta squeek noise when you start off driving, you dont have to excellerate much to hear it. actualy you can be just kreeping and you can hear it. i dont think that it is the infamous clunk noise that many people refer to, becuase i dont think it really sounds like a clunk. it sounds almost identical to pulling our heavy off-shore boat, its kinda like a low pitched squeek, if that makes any sence. i dont think it is the u-joints because they are fairly new and i have tried moving them every whitch way with my hand and cant find any slack, but that might mean nothing at all.