SSA12 | SuperSprings for Chevrolet|GMC Express|Savana 2500|3500, Ford E-250, Nissan NV 2500|3500 Sold as a pair (left and right). Maintenance-free. Self-adjusting suspension stabilizing system. 1900 (lb) Additional Load-Leveling Ability. Reduces body roll up to 30% without compromising ride quality.