Thanks very much. The car has 90K miles. I assumed something was worn out, and i imagine it would be somewhat of a common problem. I wish there was a web site that showed common problems for specific car models and years and frequency of occurrance. Usually, the same items wear out on each type car.
The car rides fine so I would rule out a bent spindle or a bearing would either make noise or show a loose wheel Your right something is worn. BTW it's on both rear wheels.
Jerry