This 4" system is designed to lift your Ford Super Duty. 4" front leaf springs provide room for 35” tires. This system uses a custom progressive pack for ultimate ride quality while providing 4" of lift. This system comes with a 1.75" bump stop spacer (not pictured) to prevent spring fatigue during the suspension cycle. Also included in this kit is 4” rear block kit with 15” U-bolts for a leveled stance. This system is the ideal for all Super Duties.