Rear Spring 5.5in ID 12in Tall Single Pigtail

The Rear Spring 5.5in ID 12in Tall Single Pigtail by HYPERCO is a performance-grade coil spring engineered for vehicle suspension upgrades, drag racing, and custom automotive builds where precision load control matters. This spring is designed for builders and enthusiasts who need a direct replacement or upgrade option for rear-end applications requiring exact spring rates and consistent ride height. Whether you're tuning a street machine, preparing a track car, or fine-tuning weight transfer characteristics, this HYPERCO spring delivers the repeatability and durability expected from one of the suspension industry's most respected manufacturers.

HYPERCO springs are manufactured using premium-grade steel and precision-wound to exact specifications, ensuring minimal tolerance deviation and consistent spring rate throughout the coil's lifespan. The 5.5-inch inner diameter and 12-inch height configuration positions this spring for specific chassis geometries common in rear-axle housings and independent rear suspension setups. The single pigtail design—a squared-off mounting end—provides a clean interface with spring perches and locating blocks, eliminating binding and promoting controlled deflection under load. At 6.43 pounds, this spring is lightweight enough for race applications while maintaining the structural integrity required for repeated compression and extension cycles on both street and strip.

Mechanics and fabricators benefit most from HYPERCO's dimensional consistency—the 6.5 x 6.4 x 13.6-inch package allows accurate fitment planning and clearance verification before installation. This rear spring suits independent rear suspension conversions, coilover upgrades, and factory replacement scenarios where OEM springs no longer meet performance goals. Proper installation requires correct spring seating, perch alignment, and preload adjustment to maximize handling balance and prevent suspension noise or clunking. Consult your vehicle's suspension geometry and desired spring rate before ordering to ensure this spring matches your target ride height, weight transfer, and handling characteristics.