Enhance your vehicle's load-carrying capacity with SuperSprings' rear SumoSprings. Each SumoSpring is handcrafted with care, resulting in unique natural characteristics like subtle color variations and surface bubbles - a testament to the craftsmanship behind every piece. These maintenance-free rear suspension enhancements are designed to provide a better driving experience. Crafted from microcellular polyurethane, they reduce rear-end sag, increase load capacity, and minimize vibration, sway, and harsh rebounds. The SSR-140-54 has a 2,800 pound capacity when compressed 50 percent. To maintain full memory rebound, the Yellow SumoSprings should not be compressed beyond 55 percent of their original height. SuperSprings International got its start in South Africa some 30 years ago, and since then they've become a globally acclaimed brand with a mission to make journeys better all over the world. These Yellow SumoSprings are backed by SuperSprings limited lifetime warranty against defective materials and workmanship. - Vehicle Compatibility: Fits 1999-2016 F250 Super Duty, 1999-2016 F350 Super Duty; Fits 4x4 models only.