Designed to control torque roll, providing equal bite on rear wheels through limited axle windup. These springs don't lock up the rear, but allow it to move, keeping the tires on the track where they belong. The rear springs listed below have a 20-inch front segment and require a longer front spring hanger bracket for B-, E-, F-, J- and M-Bodies (not included). Standard hanger brackets used on A-Body. When P3412002/03 is used on a B or E body frame, the rear spring eye in the frame must be relocated forward; Pinion Snubber is recommended. If using P4120863, vehicle will not be level at standstill.