Fits: 2003–2010 Dodge Ram 2500 2003–2008 Dodge Ram 1500 2003–2010 Dodge Ram 3500 1999–2004 Chevrolet Silverado 2500 2001–2010 Chevrolet Silverado 2500 HD 2007 Chevrolet Silverado 2500 HD Classic 1999–2004 GMC Sierra 2500 2001–2010 GMC Sierra 2500 HD 2007 GMC Sierra 2500 HD Classic 2008–2010 Ford F-250 Super Duty 2008–2010 Ford F-350 Super Duty 2011–2012 Ram 2500 2011–2022 Ram 3500 Hellwig61901Leaf Springs & AccessoriesSilent Support Sustem Series up to 2500 lbs. Level Load capacity. Great for ½, ¾ and 1 ton applications. Over axle mounting design makes for a quick and easy installation. ATTENTION: IF EQUIPPED WITH FACTORY CONTACT OVERLOAD SPRINGS CHECK VEHICLE FITMENT ABOVE FOR SPECIFIC INFORMATION ON YOUR YEAR AND MODEL VEHICLE.Hellwig Pro Series progressive rate helper spring kits are fully adjustable to ensure improved side-to-side leveling control. Designed to virtually eliminate sagging, they are made from high-quality alloy spring steel, hot-formed and heat-treated for strength and durability. Hellwig Pro Series helper springs include all mounting hardware needed for installation.