13in. x 5in. x 450# Rear Spring

The 13in. x 5in. x 450# Rear Spring is a heavy-duty leaf spring assembly engineered for vehicle suspension systems where increased load capacity and ride stiffness are essential. Built for trucks, trailers, and performance vehicles that regularly carry heavy payloads or tow substantial weight, this rear spring handles the demanding task of maintaining axle control while preserving chassis geometry under stress. Whether you're upgrading a work truck, restoring a classic hot rod, or tuning a performance build, the correct rear spring rate directly influences handling, braking performance, and tire contact patch consistency.

This 450-pound spring rate rear spring measures 13 inches in length with a 5-inch width, delivering a stiff progressive load curve ideal for vehicles operating near their GVWR (Gross Vehicle Weight Rating). The compact 5.7 x 5.5 x 14.6-inch footprint and 11.3-pound weight make it suitable for tight rear axle configurations while maintaining the structural rigidity needed to control wheel articulation and prevent axle hop during acceleration or hard braking. The 450# rating ensures minimal deflection under heavy-load scenarios, keeping the suspension geometry stable and preserving suspension travel for uneven terrain or sudden shock loads.

This rear spring performs best in applications where factory springs cannot meet load demands or where stiffer valance is necessary for performance driving. It pairs effectively with upgraded shocks, air springs, or load-leveling kits to create a balanced rear suspension capable of handling consistent payload or racing dynamics. Installation requires proper alignment with existing spring perches and U-bolt torque specifications; always consult your vehicle's service manual or a suspension specialist to ensure correct fitment and to verify compatibility with your specific axle type and mounting configuration.