Spring 4in Coil-Over 3.0in ID Silver

The EIBACH Spring 4in Coil-Over 3.0in ID Silver is a performance coil spring engineered for builders and enthusiasts seeking precise suspension tuning and lowered ride height. This coil-over spring is the foundation of any modern performance suspension system, replacing factory springs to deliver controlled compliance and adjustable ride characteristics. Whether you're building a track-focused setup or refining daily-driven geometry, this Eibach spring delivers the engineering precision and repeatability that separates professional builds from guesswork.

Manufactured from high-quality steel and finished in durable silver powder coat, the Spring 4in Coil-Over 3.0in ID Silver features a 500 lb/in spring rate and a 3-inch inside diameter that accommodates standard coil-over shock bodies. The 4-inch free length positions this spring in the mid-range for most applications, allowing you to pair it with adjustable dampers to dial in both compression and rebound independently. The 500 lb/in rate provides meaningful stiffness for body control without sacrificing ride quality on rougher surfaces, making it suitable for road course work, autocross, and street applications where bump compliance matters.

This spring works with any coil-over shock featuring a 3-inch ID collar and is commonly used in custom chassis builds, vintage car restorations, and modern performance vehicles running aftermarket suspension kits. Proper installation requires measured preload setup and ride height adjustment; spring rate selection should always account for vehicle weight, center of gravity, and intended use. Installation pairs best with matched shock absorbers and a complete geometry package to maximize handling response and consistency.