Conventional Spring 11in x 5.5in x 400lb

The Conventional Spring 11in x 5.5in x 400lb by Swift Springs is a precision linear coil spring designed for suspension tuning, chassis dynamics, and custom vehicle builds. This spring is ideal for performance car upgrades, classic restorations, and track setups, delivering controlled rates and consistent load support that serious modifiers require.

With a spring rate of 400 pounds per inch (lb/in), this coil provides substantial support for lowered platforms, forced-induction vehicles, and high-downforce applications where factory springs may compress too easily under load. Swift Springs' conventional design ensures reliable performance across a wide operating range without the complexity of adjustable or progressive systems.

Mechanics and enthusiasts choose the 11in x 5.5in x 400lb spring for both street and competition builds where handling precision is crucial. It pairs well with adjustable dampers, anti-roll bars, and geometry corrections to optimize corner balance and minimize body roll during aggressive cornering.