2017-2026 Super Duty 4x4 Full Progressive Leaf Spring Kit - 1" Lift (CS-FFSP-LVL-17)Description Providing you with a more supple and planted ride with only a slight reduction in 3 4 Ton load capacity. Emphasizing ride quality and consideration for capacity respective to the 3 4 to 1 ton platform, but with an improved ride quality. Built by Deaver Spring Mfg exclusively for Carli Suspension, the full length progressive leaf springs are a 2 stage pack designed for the daily driver, featuring more progression in the spring rate within a