Improve your Super Duty's ride quality with this rear leaf spring pack from ICON. Created from high quality materials, this spring pack is created to be durable and reliable. Installing this spring pack can ensure a smooth ride, especially while towing or hauling. Putting this onto your truck means that there is less of a chance of causing spring fatigue which means it will be less likely that your vehicle will sag under pressure. Part of the design includes the bottom two leaves of the pack that are flat to prevent harsh bottoming out and promote smoother transitions throughout the overall suspension cycle. ICON also backs this product to have a limited lifetime warranty.