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). When used on a "B" or "E" body frame, the rear spring eye in the frame must be relocated forward; Pinion Snubbed is recommended. If using P4120863, vehicle will not be level at standstill. Mopar parts and accessories are engineered and built specifically for your vehicle providing the precise fit, finish and quality you can always expect from Mopar to keep your vehicle looking and running its best.