Bump Stop Spring Flat Wire 400

The Bump Stop Spring Flat Wire 400 from SWIFT SPRINGS is a precision suspension component engineered to control chassis compression and prevent bottoming-out in vehicles experiencing aggressive suspension travel or heavy payload conditions. Whether you're building a lifted truck, upgrading a performance suspension system, or restoring a classic with modern damping control, this bump stop spring plays a critical role in protecting your suspension geometry and extending component lifespan. Bump stops are often overlooked in suspension design, yet they absorb final-stage compression energy that coil springs and dampers alone cannot handle safely.

The flat wire construction of this SWIFT SPRINGS bump stop delivers superior load-bearing characteristics compared to round-wire designs, offering enhanced stiffness per unit weight and more consistent spring rate throughout the compression stroke. The 400-rated specification indicates progressive spring force output calibrated for mid-range suspension applications, making it suitable for both daily-driven vehicles and moderate off-road duty. Flat wire design also reduces coil bind potential and provides superior lateral stability during cornering events, ensuring predictable suspension behavior across varying road surfaces and driving conditions. At 0.65 lbs, this lightweight component minimizes unsprung mass while maintaining the rigidity necessary to prevent metal-to-metal contact that can cause frame damage.

Mechanics and suspension specialists install bump stop springs as part of complete suspension overhauls, lift kit upgrades, or rear-axle assemblies where compression limits must be precisely managed. This component is essential for vehicles carrying added weight—whether engine modifications, auxiliary equipment, or towing capacity increases—that compress the suspension beyond factory geometry. The compact 4.7 x 2.6 x 7.4 inch dimensions make this bump stop compatible with most modern strut and coilover mounting points. Proper installation requires positioning the spring between the chassis contact point and suspension arm, ensuring full compression travel remains controlled without premature contact.