2017-2026 Super Duty 4x4 HD +1000lbs Progressive Leaf Spring Kit - 1" Lift (CS-FFSP-LVL-17-HD)Description These Heavy Duty Full Replacement Leaf Springs are designed for those with constant 1,000 lbs in the bed. They operate the same way as standard leaf springs when loaded. If the bed of your truck is empty, they are quite rigid. They provide 15" of increased wheel travel, 1" of rear lift, and deliver smoother suspension cycling over terrain without the use of lift blocks. These leafs feature a 9 leaf main and a 3 leaf overload for less