Mustang II Coil Spring - 2.5/3.5 x 8 700#

The Mustang II Coil Spring 2.5/3.5 x 8 700# by QA1 is engineered for builders and enthusiasts tackling modern coilover conversions on classic muscle cars and street machines. This progressive-rate spring delivers the compliance needed for street-driven vehicles while maintaining the structural integrity critical for handling upgrades and suspension geometry changes. Whether you're converting a vintage Mustang II platform to independent front suspension or upgrading an existing coilover setup, this spring bridges the gap between comfort and performance without sacrificing geometry control or ride quality.

Manufactured by QA1, a trusted name in suspension engineering, this coil spring features a 700-pound rate with a 2.5-inch inside diameter and 3.5-inch outer diameter, precision-wound to exact tolerances for repeatable performance across multiple load cycles. The 8-inch free length and 700# spring rate combination allows for fine-tuned compression damping without excessive preload, critical for maintaining proper suspension travel and preventing premature wear on shock absorbers. The spring's compact design minimizes installation complexity while optimizing packaging for retrofit applications, making it ideal for coilover kits that demand precise spring rates and consistent ride height control.

Mechanics and restoration shops frequently specify this spring for Mustang II-equipped vehicles, vintage hot rods, and custom suspension builds where OEM springs fall short of performance expectations. Its 6.62-pound weight ensures minimal unsprung mass while the linear rate curve provides predictable handling response across varied driving conditions. Installation pairs seamlessly with adjustable coilover shocks and quality control arms; verify your specific coilover platform's bore diameter and mounting hardware before purchase to ensure proper fitment and optimal suspension geometry alignment.