4in Coil Over Spring

The 4-inch Coil Over Spring by Landrum Springs is a precision-engineered suspension component designed for automotive enthusiasts and fabricators building custom lowered, lifted, or adjustable coil-over suspension systems. This spring serves as the core load-bearing element in modern performance and street applications where ride height adjustment, damping tuning, and consistent spring rates are critical to vehicle dynamics and handling characteristics.

Measuring 4.6 inches in outer diameter with a 9.3-inch overall length and weighing just 1.15 pounds, this coil-over spring delivers consistent linear or progressive spring rates that integrate seamlessly with aftermarket damper assemblies and height-adjustable mounting platforms. The 4-inch designation refers to the coil diameter, a standard size that pairs with industry-standard monotube and twin-tube shock absorbers, allowing precise tuning of suspension stiffness independent of damping characteristics—critical for dialing in corner weights, ride frequency, and vehicle squat and dive characteristics on road course, street, and drift applications.

Fabricators, suspension shops, and performance builders rely on Landrum Springs coil-over springs when constructing custom suspension packages for Miatas, 240SX platforms, BMW E36/E46 builds, and full-tube chassis drag and road race vehicles. Installation requires removal of the existing suspension assembly and mounting of the spring onto a compatible aftermarket coil-over shock body; proper installation demands correct spring seating, preload adjustment, and verification that installed ride height and spring rate suit your vehicle's weight distribution and intended use—street driving, autocross, or circuit racing.