Coilover Spring 10in x 2.5in x 400lb

The SWIFT SPRINGS Coilover Spring 10in x 2.5in x 400lb is a precision-engineered suspension component designed for serious automotive enthusiasts and mechanics upgrading vehicle handling dynamics. This coilover spring sits at the heart of modern suspension tuning, allowing drivers to dial in ride height, spring rate, and damping characteristics for everything from weekend track days to aggressive street applications. Whether you're building a performance street car, competition platform, or restoring a classic with modern suspension geometry, this 400-pound spring rate provides the stiffness necessary to control weight transfer, reduce body roll, and maintain consistent suspension geometry under load.

Built to SWIFT SPRINGS' exacting standards, this coilover spring features a 10-inch compressed length and 2.5-inch inner diameter—specifications that place it in the mid-range performance category suitable for most street-oriented coilover kits. The 400-pound spring rate strikes a balance between ride comfort and cornering control, resisting squat during acceleration and dive during braking while remaining drivable on uneven pavement. Precision-wound and shot-peened, the spring resists fatigue and maintains consistent preload even after thousands of compression cycles, critical for long-term reliability in demanding applications. The compact 4.6-pound weight keeps unsprung mass minimal, improving suspension responsiveness and reducing tire load variance.

This spring integrates seamlessly into complete coilover assemblies, commonly used in front or rear suspension packages depending on vehicle weight and geometry. Mechanics and tuners specify 400-pound springs for vehicles running aggressive alignment angles, lowered platforms, or modified chassis where factory spring rates prove insufficient. Proper installation requires pairing with complementary damping—either external shock absorbers or internal monotube cartridges—and confirming that vehicle load capacity remains within designed parameters. Always consult manufacturer compatibility charts and suspension geometry specifications before installation to ensure optimal performance and safety.