UMI Performance · New
UMI Performance 64-66 GM A-Body Factory Height Springs Rear
MPN 4048R · Store SKU umi4048R
Supplier stock checked 11/7/2026, 6:56:37 AM UTC. Adding a part does not reserve it.
Request a return within 30 calendar days after delivery. New parts must be unopened and unused.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
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. UMI’s springs are designed to add modern handling and a crisp ride while maintaining the factory muscle car appearance. The rear 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 and general 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. Designed to maintain the factory muscle car appearance with today’s modern feel. Linear spring rate provides a firm yet comfortable ride and incredible handling. 4048R - 1964-1966 GM A-Body Factory Height Springs, Rear Suitable for Pro-Tour, Auto-x and general cruising. No more floating feeling. Manufactured in the USA.
Manufacturer fitment & guides
Check 4048R against the manufacturer’s application information below.
Part-specific notes
- California Proposition 65: Y
