Coil Spring Conv Rear 13in x 5in x 175lb

The Coil Spring Conv Rear 13in x 5in x 175lb from SWIFT SPRINGS is a precision-engineered rear suspension component designed for vehicles requiring reliable load support and consistent spring performance. This conventional coil spring is built for builders, suspension technicians, and restoration specialists who demand predictable handling characteristics and long-term durability in rear-end applications. Whether upgrading a muscle car, off-road build, or maintaining factory specifications, this spring delivers the consistent ride height and load capacity needed for controlled handling and comfort.

Constructed from high-quality steel and finished with a protective black powder coat, this rear coil spring features a tight helix design that minimizes bind and ensures predictable compression under load. The 175 lb/in spring rate provides balanced stiffness—firm enough to control vehicle weight and body roll, yet compliant enough to absorb road imperfections without excessive harshness. At 13 inches in length with a 5-inch outer diameter, the spring is engineered to fit standard rear suspension geometry while maintaining proper clearance in typical mounting brackets. The tight helix configuration reduces coil-to-coil contact, extending service life and preventing premature fatigue failure.

This rear coil spring is ideal for street cars, performance builds, and classic vehicle restorations where OEM-specification or mild performance suspension tuning is desired. The 175 lb/in rate pairs well with vehicles in the 3,000–4,500 lb range and works effectively with both independent and solid-axle rear suspension designs. Installation is straightforward in most applications—secure the spring in the lower mount and compress during installation. Verify spring pocket clearance and suspension geometry before final assembly to ensure safe operation and predictable handling.