13in. x 5in. x 375# Rear Spring

The LANDRUM SPRINGS 13in. x 5in. x 375# Rear Spring is engineered for drivers and mechanics seeking to upgrade vehicle suspension geometry with a heavier-duty spring rate. This rear spring component is purpose-built for applications requiring increased load capacity and improved handling response, making it ideal for modified vehicles, performance builds, or trucks carrying additional payload without sagging the chassis. Whether you're tuning a street machine, preparing a track platform, or restoring ride height on a heavily modded build, this spring delivers the structural support modern driving demands.

Landrum Springs manufactures this rear spring with a 375-pound spring rate, a specification that controls vertical compliance and load distribution across the rear axle assembly. The 13-inch coil diameter and 5-inch compressed height are dimensionally optimized to fit within standard rear suspension geometry while maintaining ride quality and anti-squat characteristics during acceleration. The robust coil design resists fatigue from repeated compression cycles, road shock, and sustained load conditions—critical factors for longevity in performance or heavy-duty applications where OEM springs would prematurely fail or allow excessive chassis droop.

Mechanics and enthusiasts upgrading leaf or coil-spring rear suspensions benefit most from this component when paired with matching front spring rates and appropriate damping tuning. The LANDRUM SPRINGS rear spring performs effectively in custom lowering kits, four-link or three-link rear suspension conversions, and restorations requiring stiffer spring geometry to compensate for modern tire loads and braking stress. Installation requires proper alignment verification and shock absorber evaluation post-installation; verify fitment against your specific vehicle platform, as suspension geometry varies significantly across makes and model years.