All SuperSprings are manufactured in the U.S.A.
SuperSprings for RAM 2500|3500, Ford F|E Series, Chevrolet|GMC Silverado|Sierra 3500, Nissan UD;SSAXX. from SAE5160H high grade, shot peened steel.. SuperSprings Leaf Helper Spring Set - SSA40 SuperSprings are a unique and patented self-adjusting suspension stabilizing system for vehicles with rear leaf springs, designed to level loads and reduce body roll.