This 6" system is designed to lift your Ford Super Duty by replacing the front and rear leaf springs. 6" front & rear leaf springs provide room for 35" tires. This system uses a custom progressive pack for ultimate ride quality, while providing 6" of lift. This system comes with a 1.75" bump stop spacer (not pictured) to prevent spring fatigue during the suspension cycle. This kit is ideal for Ford Super Duties with worn out leaf springs.