The Flagg Suspension Parts F-Series Rear Leaf Spring Shackle is designed to increase suspension down travel and provide a smoother ride. This shackle is made with high-quality materials for durability and longevity and the mounts of the shackle will have an increased leverage. This shackle is designed for a perfect fit and easy installation on Ford E350 / E450SD Trucks. FleetPride is your First Click in Heavy Duty®.