UMI Performance · New
UMI Performance 64-66 GM A-Body 1in Lowering Spring Set Rear
MPN 4052R · Store SKU umi4052R
Supplier stock checked 11/7/2026, 9:17:37 AM UTC. Adding a part does not reserve it.
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Product details
A spring is a spring right? Wrong! When UMI chose to manufacture our own line of springs we went all out. Designed in conjunction with a leading Sprint Cup chassis engineer, these springs are the best in the business. These springs are wound from 9254 CrSi premium wire and feature a linear 130 lb/in rate. The linear rate provides consistent handling characteristics which are important for Auto-x and Pro-Tour applications while the increase in stiffness reduces body roll and prevents the “floating” feeling so common with the A-body. These springs are suitable for Auto-x and Pro-Tour applications as well as corner carving/cruising. They have a tough black powder coat finish and UMI proudly manufactures these premium quality springs in the USA. Consistent rates and only the best materials (premium Chrome Silicon wire) ensure your cars sits properly for years to come. As an industry leader in the muscle car suspension industry, UMI is proud to bring you the best spring in the business. Linear spring rates (530 lb/in front, 130 lb/in rear) provides a firm yet comfortable ride and incredible handling. 4052R - 1964-1966 GM A-Body 1” Lowering Spring Set, Rear Suitable for Pro-Tour, Auto-x and general cruising. No more floating feeling.
Manufacturer fitment & guides
Check 4052R against the manufacturer’s application information below.
Part-specific notes
- California Proposition 65: Y
