I've always had a wine in the rear end when cruising under really light throttle. I thought I had a tire vibration and I went to get them rebalanced,they were fine. I got the guy to test drive the car(he's small shop nice guy) and he says I've got a bearing in the rear end gone. We put it on stands and let the wheels spin and yup there's a noise. So I guess I am gonna learn how to fix a rear end next. New bearings for sure,what do you guys think about the posi and the gears. How will I be able to tell if they are bad and need to be replaced??My car has 240,000 miles on it so I know I have a lot of these type projects ahead of me I am rebuilding it a little at a time.