[Blacdout96]

Before you put it in drive, did you torque the lug nuts down to proper spec? Only way your axle would move far is if your c clip went bad, or a bearing went bad. If the face of the axle went bad, well that would be first I've head, but if the rear axle hit a curb by sliding into it, I guess it would be possible. Take the rotor off, and clean any rust, or crap built up on it, also check to see if the rotor isn't out of round, I wouldn't be suprised if the advance auto rotors were bad, especially if they stocked them on the shelve on their sides instead of laying flat.