Coil Spring - 2.5in x 9 350#

The Coil Spring – 2.5in x 9 350# is a high-travel coil-over suspension component designed for serious vehicle modification enthusiasts and fabricators building custom lifted or lowered chassis. This direct-replacement spring serves as the foundation for independent suspension tuning, allowing builders to dial in precise ride height and handling characteristics without factory limitations. Whether you're constructing a rock crawler, off-road buggy, or street performance suspension, this 350 lb/in spring rate provides the stiffness needed for controlled articulation and load support in demanding applications.

This coil spring features a 2.5-inch inside diameter and 9-inch compressed length, making it compatible with standard coil-over shock assemblies and custom suspension brackets. The 350 lb/in spring rate—meaning the spring compresses one inch under 350 pounds of force—offers a moderate-stiff profile suitable for vehicles carrying moderate payload or requiring stable handling under cornering loads. Steel construction with a silver powder coat finish provides durability against corrosion and UV exposure, while the helical design ensures consistent force delivery and longevity across thousands of compression cycles. This spring rate balances comfort for street use with the response needed for off-road terrain or track driving.

Mechanics and fabricators select this spring when building custom independent suspensions, coil-over kits, or upgrading underperforming OEM setups. The 350 lb/in rate works best paired with compatible shock absorbers rated for high-travel applications and matched to your vehicle's total sprung weight. Installation requires proper spring compressor tools and suspension geometry knowledge; improper installation or mismatch with shock valving can compromise ride quality and handling. For lifted trucks, performance cars, or purpose-built machines, verify that your shock's travel range and valving complement this spring rate to achieve optimal suspension tuning.