[83_P_944]

Howdy,
I had the same problem. You need to replace the wheel bearings (Inner, outer, and two seals). It'll cost $60.00 in parts (from NAPA) to do each wheel. I fixed the bad one on one weekend and then the other one a few weeks later. Don't wait very long to fix it because you could lose your tire and maybe more.
To make sure this is the problem, 1) Look at the rear of the car. Is one tire at a slant? 2) Jack up the car and pull on both sides of the tire. Does it move (swivel) or is it tight? 3) Does the car sway side to side when you accelerate?
If you've answered yes to the questions, that's probably your problem. While you've got her up in the air, check your CV boots to see if they're in good shape (not cracked).
Make sure you have a strong "clip ring removal tool". The book says to compress the bearings in, but you can use a 2" diameter pipe to CAREFULLY tap them in.
Good luck to you, sir. I hope this helps. 83_P_944