UMI 4048R Rear Factory-Height Springs for 1964-1966 GM A-Body (130 lb/in Rear)

Vehicle Fitment

• 1964-1966 GM A-Body platform
• Buick: Gran Sport ('65-'66), Skylark, Special, Sportwagon ('64-'66)
• Chevrolet: Chevelle, El Camino, Malibu ('64-'66)
• Oldsmobile: 442, Cutlass, F-85, Vista Cruiser ('64-'66)
• Pontiac: GTO, Tempest, LeMans ('64-'66)

Fitment Notes

• Rear springs only; front springs sold separately (see part 4048F or full kit 4048).
• Factory ride height--designed to complement original chassis geometry.
• Direct bolt-in replacement; no modifications required.

Features

• Made in the USA from premium 9254 chrome-silicon wire with 130 lb/in linear spring rate.
• Developed alongside a Sprint Cup-level chassis engineer for enhanced handling without sacrificing comfort.
• Durable black powder-coat finish resists corrosion and maintains classic muscle car appearance.
• Improves body control, reduces "floating" feel, and enhances Auto-X and Pro-Tour performance.

Specifications

• Part Number: 4048R
• Position: Rear springs
• Spring Rate: 130 lb/in (linear)
• Material: Chrome-Silicon wire
• Finish: Black powder coat
• Quantity: Sold as a pair (2 springs)

Included Components

• 2x UMI 4048R rear coil springs

Product Description

The UMI 4048R rear springs deliver a revitalized factory-height ride for your classic 1964-1966 GM A-Body--be it a Chevelle, GTO, Skylark, or Cutlass. Featuring a precision-engineered linear 130 lb/in rate using premium chrome-silicon wire, these springs enhance mid-corner control and reduce the float common in vintage setups.

Designed in collaboration with NASCAR-level chassis engineers and finished in a durable black powder coat, the 4048R maintains original ride height while modernizing handling dynamics. These rear springs are a plug-and-play performance upgrade with a clean, timeless look--and no modifications required.