Carli Rear Progressive Spring Packs are designed to provide a much smoother and more predictible ride while suppoting up to 15" of rear wheel travel. Paylode is reduced to "light 3/4 ton capacity" in order to provide the best ride quality. Includes springs, rear bump stop drops, and u-bolt kit. Allows for 37" tire clearance. This Part Fits: Year Make Model Submodel 2009-2010 Ford F-250 Super Duty Cabela's 2008-2009 Ford F-250 Super Duty FX4 2008-2010 Ford F-250 Super Duty Harley-Davidson Edition 2008-2010 Ford F-250 Super Duty King Ranch 2008-2010 Ford F-250 Super Duty Lariat 2008-2010 Ford F-250 Super Duty XL 2008-2010 Ford F-250 Super Duty XLT 2009-2010 Ford F-350 Super Duty Cabela's 2008-2009 Ford F-350 Super Duty FX4 2008-2010 Ford F-350 Super Duty Harley-Davidson Edition 2008-2010 Ford F-350 Super Duty King Ranch 2008-2010 Ford F-350 Super Duty Lariat 2008-2010 Ford F-350 Super Duty XL 2008-2010 Ford F-350 Super Duty XLT