Upgrade your Ford F-350âs rear suspension with the RAS HD Suspension Kitâdesigned specifically for 2011â2025 models without factory overload springs. This bolt-on RoadActive Suspension system strengthens your rear leaf springs by 30â40%, reducing squat, sway, and bounce while providing a smoother, more stable ride under load or unloaded. Unlike air bag systems, RAS is fully mechanical and maintenance-freeâno compressors, air lines, leaks, or constant adjustments are required. The included heavy-duty helper springs stabilize your truck for towing and hauling while maintaining or improving stock unloaded ride quality. Each kit ships fully assembled and is ready for fast, bolt-on installation. Key Features:• Fits 2011â2025 Ford F-350 trucks without factory overload springs• Strengthens rear leaf springs by 30â40% for added support• Includes RAS Heavy Duty Helper Springs for each rear leaf spring• Reduces rear-end squat, body roll, bounce, and axle wrap• Progressive load support for towing and hauling• Maintenance-freeâno air lines, leaks, or adjustments needed• Fully assembled for fast, bolt-on installation (~45â60 minutes)• Same-as or better-than stock unloaded ride quality Reduces rear squat and bounce under heavy loads Improves stability and road handling while towing or hauling Maintains smooth, comfortable ride when unloaded | RAS HD Suspension Kit for 2011 2025 Ford F-350 (No Factory Overload Spring)