SKU: SSSD400
MPN: D8-400
The 8in x 400# Coil Over Spring (Part Number D8-400) from Suspension Springs is a precision-engineered coil-over suspension component designed for custom vehicle builds and performance modifications. This 8-inch coil-over spring features a 400 lb/in spring rate and a 2.5-inch inner diameter, making it suitable for mid-range suspension tuning applications where balanced ride quality and load support are priorities.
Constructed from high-grade steel with a blue epoxy coating for corrosion resistance, this spring maintains its structural integrity across varied driving conditions and temperature ranges. The 400 lb/in spring rate positions this component in the moderate stiffness range—stiffer than stock springs but less aggressive than extreme performance setups. This rate suits street and light off-road use where occupant comfort must coexist with improved handling response. The 8-inch length accommodates most coil-over shock assemblies, and the 2.5-inch ID ensures compatibility with standard shock bodies used in aftermarket suspension kits.
This spring is ideal for builders upgrading from factory suspension geometry to lowered or adjusted ride heights. Enthusiasts performing full suspension overhauls, drag racing prep, or autocross-focused builds rely on matched coil-over spring sets to achieve consistent wheel articulation and body control. The blue epoxy finish provides visual distinction while protecting against salt spray, moisture, and brake dust—critical for long-term durability in coastal or harsh climates. Weighing 2.75 lbs, this individual spring integrates easily into four-spring suspension kits.
When selecting coil-over springs, matching spring rate across all four corners is essential for balanced handling. The 400 lb/in specification should be paired with compatible shocks tuned to the same load rating to prevent oscillation and ensure predictable suspension behavior under cornering and braking. This component is sold individually; a complete four-corner application requires four springs of equal rate.
WARNING ⚠️
You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
Purchasing a Firearm? Click HERE to see our firearm purchasing guide.
