SuperSprings SSA23 are a unique and patented self-adjusting suspension stabilizing system for vehicles with rear leaf springs, designed to level loads and reduce body roll. SuperSprings provide users extra load support and reduce body roll without compromising ride quality. They are manufactured using a variety of different-sized springs to support multiple applications. All SuperSprings are manufactured in the U.S.A. from SAE5160H high-grade, shot-peened steel. Self-AdjustingSuperSprings automatically adjust to level loads and reduce body roll. SuspensionSuperSpring rollers take on the weight in concert with the main spring pack as weight is added to your vehicle. StabilizationSuperSprings provide users extra load support and reduce body roll without compromising ride quality.• Maintenance-free• Self-adjusting suspension stabilizing system• 2300-lb. additional load-leveling capacity• Reduces body roll up to 30% without compromising ride quality• Works in conjunction with original equipment leaf spring assembly• Adjustable shackles allow installation to suit various needs• Typical installation completed in about an hour• SAE 5160H high-grade steel• Shot peened to relieve spring stress and extend product life• 49"L x 3"W x 0.56"H• Weight: 76 lbs. eachApplicationsChevrolet Express 4500 4x2 (2009-2025)Chevrolet Silverado 3500 4x2 (2001-2006)Chevrolet Silverado 3500 4x4 (2001-2006)Chevrolet Silverado 3500 Classic 4x2 (2007-2007)Chevrolet Silverado 3500 Classic 4x4 (2007-2007)Chevrolet Silverado 3500 HD 4x2 (2011-2025)Chevrolet Silverado 3500 HD 4x4 (2011-2025)Chevrolet Silverado 3500 HD 4x2 (2007-2010)Chevrolet Silverado 3500 HD 4x4 (2007-2010)Dodge RAM 2500 4x2 (2003-2007)Dodge RAM 2500 4x4 (2003-2007)Dodge RAM 3500 4x2 (2003-2010)Dodge RAM 3500 4x4 (2003-2010)Dodge RAM 4500 4x2 (2008-2010)Dodge RAM 4500 4x4 (2008-2010)Dodge RAM 5500 4x2 (2008-2010)Dodge RAM 5500 4x4 (2008-2010)Ford F-350 Super Duty 4x2 (2008-2010)Ford F-350 Super Duty 4x4 (2008-2010)Ford F-450 Super Duty 4x2 (2011-2016)Ford F-450 Super Duty 4x4 (2011-2016)GMC Savana 4500 4x2 (2009-2025)GMC Sierra 3500 4x2 (2001-2006)GMC Sierra 3500 4x4 (2001-2006)GMC Sierra 3500 Classic 4x2 (2007-2007)GMC Sierra 3500 Classic 4x4 (2007-2007)GMC Sierra 3500 HD 4x2 (2011-2025)GMC Sierra 3500 HD 4x4 (2011-2025)GMC Sierra 3500 HD 4x2 (2007-2010)GMC Sierra 3500 HD 4x4 (2007-2010)RAM 3500 4x2 (2011-2025)RAM 3500 4x4 (2011-2025) Reduces body roll without compromising ride quality Works in conjunction with original equipment leaf spring assembly Made from SAE5160H high-grade, shot-peened steel | SuperSprings SSA23 Helper Spring Kit, Pair