WHEEL HOP OR AXLE TRAMP CAUSED THE REAR TO LOSE TRACTION AND THE STABILITY TRACK AND TRACTION CONTROL FAILED TO CORRECT THE PROBLEM. THE AXLE TRAMP IS A SEVERE BANGING OF THE REAR WHEN THERE THROTTLE IS APPLIED TO THE CAR. THE REAR SPUN AND CAUSED THE CAR TO HIT A GUARD WALL.*AK