Conventional Spring 9.5in x 5.5in x 500#

The Conventional Spring 9.5in x 5.5in x 500# by SWIFT SPRINGS is a premium coil spring designed for serious automotive suspension work, whether you're building a custom lowered setup, restoring a classic muscle car, or fine-tuning a performance platform. As a mechanic, you know that spring rate is the foundation of any handling package—get it wrong and even premium shocks and geometry work won't save your chassis. This 500-pound-per-inch spring delivers consistent, linear force across its 9.5-inch free length and 5.5-inch compressed height, making it ideal for front or rear applications where moderate spring stiffness is required for daily-driven or mildly modified vehicles.

SWIFT SPRINGS' conventional coil design uses high-carbon steel construction wound to precise tolerances, ensuring repeatability and durability through thousands of compression cycles. The 500# rate sits in the sweet spot between stock comfort and aggressive tuning—stiff enough to control body roll and squat under acceleration without inducing a bone-jarring ride on street surfaces. This spring's geometry (9.5-inch length and 5.5-inch solid height) makes it compatible with most traditional double-wishbone and MacPherson strut suspensions when paired with appropriately valved dampers and proper perch heights. The 6.42-pound weight is typical for springs of this specification and won't introduce unsprung mass penalties that plague oversized or over-stiffened alternatives.

This spring excels for builders upgrading street machines, weekend track cars, or restorations where OEM ride quality must improve without sacrificing usability. Whether you're converting from leaf springs to coil-overs, refreshing tired factory suspension, or dialing in a comprehensive handling upgrade, the conventional 500# rate works well in combination with performance shocks, adjustable ride-height platforms, and modern sway bar setups. Always verify spring seat diameter, perch location, and vehicle weight distribution before installation—improper seating or mismatched damping will negate the spring's engineering benefits and create handling issues. Pair these SWIFT SPRINGS conventionals with quality control arms, bushings, and alignment work for maximum suspension responsiveness.