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Restore Correct Ride Height Without Sacrificing Classic Muscle Car Handling
The UMI Performance UMI4049 spring kit is built for 1967 to 1972 GM A-Body owners who want factory ride height restored with modern manufacturing precision. This kit pairs a progressive front spring rate with a firmer rear spring rate to correct the nose-high stance common on aging A-Body suspensions while improving handling balance under acceleration and cornering. Each spring is cold wound from chrome silicon spring steel and finished in a durable powder coat for long-term corrosion resistance, making this kit a straightforward bolt-in upgrade for Chevelle, GTO, Cutlass, and Skylark platforms.
Key Features
- Chrome silicon spring steel construction for consistent spring rate and long service life
- Powder coat finish resists corrosion and chipping in daily and weekend driving conditions
- 530 lb/in front spring rate paired with 130 lb/in rear spring rate for balanced handling
- Restores factory ride height on sagged or aging A-Body suspension setups
- Direct bolt-in installation using factory mounting points, no cutting or drilling required
- Engineered specifically for 1967 to 1972 GM A-Body chassis platforms
Fitment Table
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 1967 | Buick | Gran Sport | |
| 1970-1972 | Buick | GS | |
| 1968-1969 | Buick | GS 350 | |
| 1968-1969 | Buick | GS 400 | |
| 1970-1972 | Buick | GS 455 | |
| 1967-1972 | Buick | Skylark | |
| 1967-1969 | Buick | Special | |
| 1967-1972 | Buick | Sportwagon | |
| 1967-1972 | Chevrolet | Chevelle | |
| 1967-1972 | Chevrolet | El Camino | |
| 1967 | Chevrolet | Malibu | |
| 1970-1972 | Chevrolet | Monte Carlo | |
| 1967-1971 | Oldsmobile | 442 | |
| 1967-1972 | Oldsmobile | Cutlass | |
| 1967-1972 | Oldsmobile | F85 | |
| 1967-1972 | Oldsmobile | Vista Cruiser | |
| 1967-1972 | Pontiac | Grand Prix | |
| 1967-1972 | Pontiac | GTO | |
| 1967-1972 | Pontiac | LeMans | |
| 1967-1970 | Pontiac | Tempest | |
| 1971-1972 | GMC | Sprint |
Specifications
| Detail | Value |
|---|---|
| MPN | UMI4049 |
| Front Spring Rate | 530 lb/in |
| Rear Spring Rate | 130 lb/in |
| Material | Chrome Silicon Spring Steel |
| Finish | Powder Coat |
| Ride Height | Factory Height |
| UPC | Not published by manufacturer |
What's Included
- Two UMI4049 front coil springs
- Two UMI4049 rear coil springs
About UMI Performance
UMI Performance specializes in suspension components for GM muscle cars, building chassis parts that improve handling while preserving the classic ride characteristics owners expect. The UMI4049 kit is manufactured in-house with a focus on correct spring rates and factory-correct fitment for A-Body restorations and daily drivers alike.
FAQ
What is the UMI4049?
The UMI4049 is a front and rear coil spring kit for 1967 to 1972 GM A-Body vehicles that restores factory ride height using a 530 lb/in front rate and 130 lb/in rear rate. UMI4049 is a direct bolt-in replacement requiring no cutting or drilling.
Which vehicles fit this spring kit?
This kit fits 1967 to 1972 GM A-Body platforms including the Chevrolet Chevelle, El Camino, and Monte Carlo, Buick Gran Sport and Skylark, Oldsmobile Cutlass and 442, and Pontiac GTO, LeMans, and Grand Prix.
Does this kit lower or raise ride height?
Neither. This kit is designed to restore the vehicle's original factory ride height, correcting sag that develops in aging suspension components over time.
What material are the springs made from?
The springs are cold wound from chrome silicon spring steel and finished with a powder coat for corrosion resistance and durability.
Is this a direct bolt-in installation?
Yes. This kit uses factory mounting locations and does not require cutting, drilling, or permanent modification to install.
What is the difference between the front and rear spring rates?
This kit uses a 530 lb/in front spring rate and a 130 lb/in rear spring rate, a combination tuned to balance handling while maintaining factory ride height across the A-Body platform.
Can this kit be installed on a GMC Sprint?
Yes. The 1971 to 1972 GMC Sprint shares the GM A-Body platform and is a confirmed fitment for this spring kit.
Will this kit work with factory sway bars and shocks?
Yes. This kit is designed to work alongside factory or upgraded sway bars and shocks without requiring additional modifications for basic installation.
Install Instructions
- Safely raise and support the vehicle on jack stands, then remove the wheels.
- Support the lower control arm with a jack and disconnect the sway bar end link if equipped.
- Carefully release spring tension and remove the factory front and rear coil springs.
- Install the springs into the factory upper and lower spring pockets.
- Reconnect the sway bar end link and lower the control arm to seat the new springs.
- Reinstall the wheels, lower the vehicle, and torque all hardware to factory specifications.
- Perform a full wheel alignment after installation to confirm proper ride height and handling.
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