Rattling like loud metallic loose change. Somewhere in the undercarriage from the middle of the car to the rear tires...can't quite place the location. But here's the kicker, it doesn't rattle when the brakes are applied. I took off the rear wheels and yanked around and banged a few things trying to replicate the sound but to no avail. I did this to both sides around the rotors/calipers/dust shield. Any other places to check? Thanks.