Russ,

Additional information...I now remember that after my wife took me for a ride in her car to show me the noise it was making that sounded like it was coming from the right rear, I got out of the car and had her take off from a dead stop and I could hear the noise and see the right rear suspension moving/vibrating.

You might want to try having someone drive the car while you are on the outside listening and watching for something abnormal.

Just a thought,

Dave