FR350SDJ Rear Air Helper Springs Kit (1 Pair – Left & Right) Part Number: FR350SDJ Material: Metal & Closed Micro-Cellular Urethane Color: Black Finish: Powder-Coated Compatibility: Designed for Ford F-350 Super Duty 4WD/2WD models (2017-2024). Overview: Upgrade your Ford F-350’s performance with the SES Suspension Enhancement System (FR350SDJ). This rear air helper spring kit optimizes ride quality, minimizes trailer sway, and strengthens stability under heavy loads. Engineered with advanced rubber cushions, it absorbs road shocks and dynamically adjusts to uneven terrain or shifting cargo weights, delivering a smoother, safer driving experience. Key Features: Effortless Installation: No drilling or air line routing required. Bolt directly onto your vehicle using basic tools for a hassle-free, leak-proof setup. Maintenance-Free Durability: Sealed design eliminates air lines and fittings, ensuring zero leaks and lifelong reliability. Enhanced Load Support: Prevents suspension sag, stabilizes cargo, and improves braking efficiency for safer towing and hauling. Adaptive Shock Absorption: Closed micro-cellular urethane cushions automatically compensate for road irregularities, reducing axle-to-frame contact and minimizing bottoming out.