13in. x 5in. x 425# Rear Spring

The 13in. x 5in. x 425# rear spring is engineered for vehicles requiring enhanced load-carrying capacity and improved suspension geometry under sustained weight. As a mechanic, you'll recognize this as a critical component for trucks, trailers, and heavy-duty platforms where OEM springs fail to handle custom modifications, cargo loads, or performance upgrades. This spring exists to restore proper ride height, maintain axle alignment, and prevent sagging that compromises handling and accelerates tire wear—a common issue when upgrading powertrains or adding auxiliary equipment.

Built with a 425-pound load rating, this leaf spring delivers consistent spring rate across the suspension travel range, resisting permanent deformation even under cyclic loading from rough terrain or towing. The 13-inch overall length and 5-inch width are calibrated for rear axle mounting on mid-to-heavy-duty applications, providing the mechanical advantage needed to support payload without bottoming the suspension or creating binding. The material composition—typical of quality automotive springs—employs heat-treated steel with controlled flex characteristics to absorb impacts while maintaining axle control and tire contact patch stability during acceleration and braking.

This rear spring is ideal for mechanics and vehicle owners restoring factory suspension geometry on work trucks, utility vehicles, or custom builds carrying consistent heavy loads. Installation requires removal of the existing spring assembly, proper alignment of the spring eye and mounting brackets, and verification that axle movement remains free throughout travel. Ensure your vehicle frame and suspension mounting points are in sound condition before installation; corrosion or damage will compromise the spring's performance and longevity. Pair this component with a suspension inspection to check bushings, shackles, and axle damping systems for optimal results.