Get the Rear Stance Right Without Touching the Front End
The UMI4052R 1 inch rear lowering spring set drops the back of your 1964 to 1966 GM A-Body to match a lowered front end or to clean up a stock ride height that always looked a little too tall in back. Wound from premium chrome silicon wire at a linear 130 lb/in rate, this rear-only kit tightens up body roll and removes the floating feeling that stock A-Body springs are known for.
Key Features
- Rear-only kit for a clean 1 inch drop without disturbing front geometry
- Linear 130 lb/in spring rate wound from premium chrome silicon wire
- Reduces body roll and eliminates the common floating feeling in A-Body rear suspension
- Suitable for Pro-Tour, Auto-x, and general street cruising applications
- Durable black powder coat finish
- Direct bolt-on installation, no cutting or modification required
- Designed and manufactured in the USA from North American raw materials
Fitment Table
| Year Range | Make | Model |
|---|---|---|
| 1965-1966 | Buick | Gran Sport |
| 1964-1966 | Buick | Skylark |
| 1964-1966 | Buick | Special |
| 1964-1966 | Buick | Sportwagon |
| 1964-1966 | Chevrolet | Chevelle |
| 1964-1966 | Chevrolet | El Camino |
| 1964-1966 | Chevrolet | Malibu |
| 1964-1966 | Oldsmobile | 442 |
| 1964-1966 | Oldsmobile | Cutlass |
| 1964-1966 | Oldsmobile | F85 |
| 1964-1966 | Oldsmobile | Vista Cruiser |
| 1964-1966 | Pontiac | GTO |
| 1964-1966 | Pontiac | Tempest |
| 1964-1966 | Pontiac | Lemans |
Specifications
| Detail | Value |
|---|---|
| MPN | UMI4052R |
| UPC | Not assigned by manufacturer |
| Brand | UMI Performance |
| Position | Rear |
| Spring Rate | 130 lb/in linear |
| Material | Chrome silicon wire |
| Finish | Black powder coat |
| Drop Amount | 1 inch |
| Country of Origin | United States |
What’s Included
- UMI4052R rear lowering spring set, quantity 2
About UMI Performance
UMI Performance designs and manufactures chassis, suspension and driveline components for GM muscle cars entirely in the United States. Every part is engineered by racers who use their own track and street experience to solve real fitment and handling problems, then built from North American raw materials with consistent spring rates and durable finishes for a repeatable fit.
Related Parts on Our Site
- UMI Performance 68-72 GM A-Body Tubular Upper & Lower Control Arms
- UMI Performance 82-92 GM F-Body Boxed Style Weld-In Subframe Connectors
FAQ
What is the UMI4052R?
The UMI4052R is a rear-only 1 inch lowering spring set for 1964 to 1966 GM A-Body vehicles, wound from chrome silicon wire at a linear 130 lb/in rate and finished in black powder coat. It drops rear ride height by 1 inch without any front end modification.
Does the UMI4052R include front springs?
No. The UMI4052R is a rear-only spring set. UMI also offers the 4052 kit, which includes matching front and rear springs for a full 1 inch drop.
Will this spring set eliminate body roll?
The linear 130 lb/in rate significantly reduces body roll compared to stock rear springs and removes the floating feeling common in unmodified A-Body rear suspension.
Is any cutting or drilling required to install the UMI4052R?
No. This is a direct bolt-on spring set that installs into the factory rear spring pockets with no cutting, drilling or welding required.
How much does the UMI4052R lower the rear of the car?
The UMI4052R lowers rear ride height by approximately 1 inch from stock, depending on vehicle weight and equipment.
What vehicles fit the UMI4052R?
This spring set fits the 1964 to 1966 Buick Gran Sport, Skylark, Special and Sportwagon, Chevrolet Chevelle, El Camino and Malibu, Oldsmobile 442, Cutlass, F85 and Vista Cruiser, and Pontiac GTO, Tempest and Lemans, based on the exact year ranges shown in the fitment table above.
Is the UMI4052R a good match for Pro-Tour or Auto-x builds?
Yes. The linear spring rate and reduced body roll make this spring set well suited to Pro-Tour, Auto-x and general street cruising applications.
What material are the UMI4052R springs made from?
The springs are wound from premium chrome silicon wire, which provides consistent spring rates and long service life compared to standard steel replacement springs.
Install Instructions
- Support the rear axle with a suitable jack and safely relieve spring pressure before removing the factory rear springs.
- Remove the factory rear coil springs from the spring pockets.
- Install the UMI4052R rear springs into the factory spring pockets, verifying correct seating top and bottom.
- Reconnect the rear axle and any disturbed suspension components.
- Lower the vehicle and torque all hardware to manufacturer specification.
- Check rear ride height and verify adequate clearance before driving.
