i spun a donut earlier in a dirt feild and then parked  after i started drving it again and only wen i accelerated it made like noise tht sounded like it was skipping from the rear end its not my u joints i just changed them a few weeks ago any suggs.  cud it be i need a new differential
I got an 89     v6 2wd?
It could be defective or improperly installed u-joints, the pinion bearing, something loose in the differential, or broken suspension components.  
When you changed the u-joints, did you notice if the yolk moved around much?  if so you need a new rear end.  if not, you may still need a new differential (or just weld it all together inside.)
I got an 89     v6 2wd?
double check the u-joints and you may have messed up the ring and pinion in the rear end also check the rear brakes.