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 designed for builders and enthusiasts working on coilover conversions for classic muscle cars and street machines. This progressive-rate spring provides the necessary compliance for street-driven vehicles while ensuring the structural integrity needed for handling upgrades and suspension geometry changes.

Manufactured by QA1, this coil spring features a 700-pound rate with a 2.5-inch inside diameter and a 3.5-inch diameter, precision-wound to exact tolerances for consistent performance across multiple load cycles. The 8-inch free length and 700# spring rate combination allow for fine-tuned compression damping, which is critical for maintaining proper suspension travel and preventing premature wear on shock absorbers.

This spring is frequently specified by mechanics and restoration shops for Mustang II-equipped vehicles, vintage hot rods, and custom suspension builds where OEM springs may not meet performance needs. Its design is optimized for retrofit applications, making it an ideal choice for coilover kits that require precise spring rates and consistent ride height control.