\"Clunk\" noise I have an 89 Jimmy with a 350, auto, and the 3.73 corporate 10 bolts. I've had both of the rear U-joints replaced and a new front driveshaft made and installed. All engine/tranny mounts are new. My problem is that I have a sort of "clunk" sound that happens between the 1-2 shift while accelerating. It's not really loud, but I can feel it lightly in the steering wheel and seat and it sounds like it's coming from the rear of the truck. Any ideas about what it could be would be appreciated. Let me know if you need more info. Thanks.