wierd noise from right rear

Recently when I have been driving around I have heard a sound that sounds like metal rubbing together almost. I looked from the driveshaft to the tire and it did not look like anyting was rubbing or out of place. It gets a little louder usually when the rear suspention bounces up and down. It does not seem to effect the driveability though. Its just damn annoying. It happend after I wheeled it so it is safe to assume I did something that it did not like. Just wondering if anyone might have an idea as to what it could be, anything would be great.

Did you find out what was making the noise yet? Only happens when suspension moves up and down, like going over a speed bump. I would almost think maybe the exhaust got bent during your wheeling and now is hitting something when the axle moves up and down. Is it a rubbing noise, like a rotating part is contacting something stationary? Or does it sound like two stationary parts hitting each other?