4057 – 1964-1972 GM A-Body Coil Over Conversion Brackets, Rear
Installation Pictures
$259.99
⚠ See fitment note
PRODUCT DESCRIPTION
The UMI bolt-in rear coilover kit provides comprehensive adjustments for ride height, spring rate, and damping, in addition to enabling trailing arm adjustments for precise calibration of the instant center. This kit is equipped with a fortified upper mount, specifically designed to accommodate a 2-1/2” racing coilover with a double-shear configuration. The lower brackets, engineered through Finite Element Analysis (FEA), are reinforced and are designed to be bolted directly onto the existing rear lower control arm mounts. These brackets also feature an adjustment mechanism for trailing arm height, facilitating the tuning of the instant center location. This product is manufactured and tested in Philipsburg, Pennsylvania, utilizing materials sourced from the United States.
We advise that the brackets be installed initially and that measurements be taken from center to center at ride height to guarantee the precise identification of shock part numbers. Regarding compatibility, this kit is designed for direct installation with a GM axle housing and standard GM brackets. It is important to note that aftermarket housings may exhibit variations in design and configuration, which could render the 4057 bracket unsuitable. For installation purposes, welding is necessary for drag racing applications involving vehicles that achieve speeds of 10.50 seconds or faster or those utilizing slick tires. Conversely, bolted brackets are appropriate for street performance, autocross, and road racing applications.
We advise that the brackets be installed initially and that measurements be taken from center to center at ride height to guarantee the precise identification of shock part numbers. Regarding compatibility, this kit is designed for direct installation with a GM axle housing and standard GM brackets. It is important to note that aftermarket housings may exhibit variations in design and configuration, which could render the 4057 bracket unsuitable. For installation purposes, welding is necessary for drag racing applications involving vehicles that achieve speeds of 10.50 seconds or faster or those utilizing slick tires. Conversely, bolted brackets are appropriate for street performance, autocross, and road racing applications.
Fitment Note: For stock axles only. Rear shocks may not clear all exhaust tail pipes.
PRODUCT FEATURES
- Full ride height, spring rate, and damping adjustments
- Trailing arm adjustment for fine tuning of instant center
- Reinforced upper mount with a true 2-1/2” racing coilover
- FEA designed reinforced lower brackets
- 2-hole trailing arm height adjustment for instant center tuning
- Designed, manufactured, and raced in Philipsburg, PA, USA
- Made with 100% US materials
- Welding required for drag use
PRODUCT FAQ
Q: What vehicles is the UMI Rear Coilover Conversion Kit compatible with?
A: The UMI Rear Coilover Conversion Kit is designed for GM A-Body vehicles, including popular models like the Chevelle. It's a direct bolt-on solution when used with a GM axle housing and stock GM brackets. For vehicles with aftermarket housings, compatibility may need to be assessed, as the bracket may not fit all layouts.Q: What is included in the Rear Coilover Conversion Kit?
A: The kit includes reinforced upper mounts for a 2-1/2” racing coilover, FEA-designed lower brackets, and all necessary hardware for installation.Q: Do I need any special equipment or skills for installation?
A: Basic mechanical skills and standard automotive tools are recommended for installation. While the kit bolts directly onto stock setups, welding is required for drag racing applications running 10.50 or faster, or when using slicks. We suggest professional installation if you're unfamiliar with suspension components.Q: Will this kit affect my vehicle's ride height?
A:Yes, the coilover kit allows full ride height adjustability, enabling you to customize the stance and handling characteristics of your vehicle according to your preference or performance needs.Q: Is this kit suitable for street use as well as racing?
A: Absolutely. The UMI Rear Coilover Conversion Kit is engineered for versatile use, suitable for street performance, auto-crossing, and road racing. For drag racing applications, specific modifications, such as welding, may be required for optimal safety and performance.Q: Are there any fitment issues I should be aware of?
A: The kit is primarily designed for stock axles and may not fit all aftermarket configurations. Additionally, rear shocks might not clear all exhaust tailpipes, so an assessment of tailpipe routing may be necessary during installation.Q: Why is this kit manufactured in the USA, and does it matter?
A:Manufacturing the kit in the USA ensures the highest quality standards, using superior US-sourced materials. This results in products that are reliable, durable, and track-tested to meet strict performance benchmarks—a key benefit for performance enthusiasts and professional racers.THIS PRODUCT FEATURES
Designed & Manufactured in the USA
Durable Powder-Coat
Precision Laser Cut Components
Precision Welds
| Fitment | |
|---|---|
| Platform | , |
| Manufacturer | |
| Modifications |
Drilling |
| Direct Bolt-On |
No |
| UOM |
Pair |
| Finish |
Powder Coat |
| Hardware |
Included |
Why Choose
UMI Performance
21 Years In The Industry
North American Raw Materials
Proudly partnering with leading USA steel suppliers, we source the finest North American mined and milled steel
Precision Bent DOM Tubing
Machine-guided DOM tubing bends maintain correct geometry while maintaining material strength.
Laser Cut Plating
We take North-American sourced plating and precision-cut each component with the latest laser-cutting technology.
Durable Powder Coating
Each finished part is properly prepped and coated with high quality Tiger Dry Lac powder coat, providing a tough long-lasting finish.
Consistent Welds
Our highly-skilled welders and robotic-welders provide consistent welds and ultimate part penetration.
100% USA Made
We take pride in providing 100% USA-Manufactured suspension components.
Shipping Guidelines
Flat Rate Shipping ($12.95) is only offered on Retail orders over $149 shipped via Ground in the Continental United States.
All International customers are responsible for any applicable duties and/or taxes incurred on your shipment upon delivery.
Return Information
All returns are subject to the authorization of UMI Performance, Inc. Please email [email protected] for a Returned Merchandise Authorization (RMA) number. Our Sales team will either authorize or deny the request for return at its discretion. Any product returned without an issued RMA number will not be credited. All returns must be made within 30 days of delivery, be in new condition, be in original sealed packaging and include the RMA number on the outside of the packaging. No exceptions. All products and their packaging must be in new and unopened condition. Products that have been altered, installed, or modified are not returnable. All shipping costs for returns are the responsibility of the customer. All returns are subject to a 20% restocking fee as well as the original shipping charges that UMI Performance may have incurred while shipping your order.
Due to the majority of Viking products being drop shipped, we can not offer returns on any Viking products. If you purchase a Viking product be sure it fits your application. If you need technical assistance prior to placing order please contact [email protected]
This '4057 - 1964-1972 GM A-Body Coil Over Conversion Brackets, Rear' fits the following platforms:
Fitment Note: For stock axles only. Rear shocks may not clear all exhaust tail pipes.
1964-1972 GM A-Body
- 1965-1967 Buick Gran Sport
- 1970-1972 Buick GS
- 1968-1969 Buick GS 350
- 1968-1969 Buick GS 400
- 1970-1972 Buick GS 455
- 1964-1972 Buick Skylark
- 1964-1969 Buick Special
- 1964-1972 Buick Sportwagon
- 1964-1972 Chevrolet Chevelle
- 1964-1972 Chevrolet El Camino
- 1964-1967 Chevrolet Malibu
- 1970-1972 Chevrolet Monte Carlo
- 1964-1971 Oldsmobile 442
- 1964-1972 Oldsmobile Cutlass
- 1964-1972 Oldsmobile F85
- 1964-1972 Oldsmobile Vista Cruiser
- 1969-1972 Pontiac Grand Prix
- 1964-1972 Pontiac GTO
- 1964-1970 Pontiac Tempest
- 1964-1972 Pontiac Lemans
- 1971-1972 GMC Sprint
This 4057 - 1964-1972 GM A-Body Coil Over Conversion Brackets, Rear fits the following vehicles:
Buick
Gran Sport
- 1965 Buick Gran Sport
- 1966 Buick Gran Sport
- 1967 Buick Gran Sport
GS
- 1970 Buick GS
- 1971 Buick GS
- 1972 Buick GS
GS 350
- 1968 Buick GS 350
- 1969 Buick GS 350
GS 400
- 1968 Buick GS 400
- 1969 Buick GS 400
GS 455
- 1970 Buick GS 455
- 1971 Buick GS 455
- 1972 Buick GS 455
Skylark
- 1964 Buick Skylark
- 1965 Buick Skylark
- 1966 Buick Skylark
- 1967 Buick Skylark
- 1968 Buick Skylark
- 1969 Buick Skylark
- 1970 Buick Skylark
- 1971 Buick Skylark
- 1972 Buick Skylark
Special
- 1964 Buick Special
- 1965 Buick Special
- 1966 Buick Special
- 1967 Buick Special
- 1968 Buick Special
- 1969 Buick Special
Sportwagon
- 1964 Buick Sportwagon
- 1965 Buick Sportwagon
- 1966 Buick Sportwagon
- 1967 Buick Sportwagon
- 1968 Buick Sportwagon
- 1969 Buick Sportwagon
- 1970 Buick Sportwagon
- 1971 Buick Sportwagon
- 1972 Buick Sportwagon
Chevrolet
Chevelle
- 1964 Chevrolet Chevelle
- 1965 Chevrolet Chevelle
- 1966 Chevrolet Chevelle
- 1967 Chevrolet Chevelle
- 1968 Chevrolet Chevelle
- 1969 Chevrolet Chevelle
- 1970 Chevrolet Chevelle
- 1971 Chevrolet Chevelle
- 1972 Chevrolet Chevelle
El Camino
- 1964 Chevrolet El Camino
- 1965 Chevrolet El Camino
- 1966 Chevrolet El Camino
- 1967 Chevrolet El Camino
- 1968 Chevrolet El Camino
- 1969 Chevrolet El Camino
- 1970 Chevrolet El Camino
- 1971 Chevrolet El Camino
- 1972 Chevrolet El Camino
Malibu
- 1964 Chevrolet Malibu
- 1965 Chevrolet Malibu
- 1966 Chevrolet Malibu
- 1967 Chevrolet Malibu
Monte Carlo
- 1970 Chevrolet Monte Carlo
- 1971 Chevrolet Monte Carlo
- 1972 Chevrolet Monte Carlo
Oldsmobile
442
- 1964 Oldsmobile 442
- 1965 Oldsmobile 442
- 1966 Oldsmobile 442
- 1967 Oldsmobile 442
- 1968 Oldsmobile 442
- 1969 Oldsmobile 442
- 1970 Oldsmobile 442
- 1971 Oldsmobile 442
Cutlass
- 1964 Oldsmobile Cutlass
- 1965 Oldsmobile Cutlass
- 1966 Oldsmobile Cutlass
- 1967 Oldsmobile Cutlass
- 1968 Oldsmobile Cutlass
- 1969 Oldsmobile Cutlass
- 1970 Oldsmobile Cutlass
- 1971 Oldsmobile Cutlass
- 1972 Oldsmobile Cutlass
F85
- 1964 Oldsmobile F85
- 1965 Oldsmobile F85
- 1966 Oldsmobile F85
- 1967 Oldsmobile F85
- 1968 Oldsmobile F85
- 1969 Oldsmobile F85
- 1970 Oldsmobile F85
- 1971 Oldsmobile F85
- 1972 Oldsmobile F85
Vista Cruiser
- 1964 Oldsmobile Vista Cruiser
- 1965 Oldsmobile Vista Cruiser
- 1966 Oldsmobile Vista Cruiser
- 1967 Oldsmobile Vista Cruiser
- 1968 Oldsmobile Vista Cruiser
- 1969 Oldsmobile Vista Cruiser
- 1970 Oldsmobile Vista Cruiser
- 1971 Oldsmobile Vista Cruiser
- 1972 Oldsmobile Vista Cruiser
Pontiac
Grand Prix
- 1969 Pontiac Grand Prix
- 1970 Pontiac Grand Prix
- 1971 Pontiac Grand Prix
- 1972 Pontiac Grand Prix
GTO
- 1964 Pontiac GTO
- 1965 Pontiac GTO
- 1966 Pontiac GTO
- 1967 Pontiac GTO
- 1968 Pontiac GTO
- 1969 Pontiac GTO
- 1970 Pontiac GTO
- 1971 Pontiac GTO
- 1972 Pontiac GTO
Tempest
- 1964 Pontiac Tempest
- 1965 Pontiac Tempest
- 1966 Pontiac Tempest
- 1967 Pontiac Tempest
- 1968 Pontiac Tempest
- 1969 Pontiac Tempest
- 1970 Pontiac Tempest
Lemans
- 1964 Pontiac Lemans
- 1965 Pontiac Lemans
- 1966 Pontiac Lemans
- 1967 Pontiac Lemans
- 1968 Pontiac Lemans
- 1969 Pontiac Lemans
- 1970 Pontiac Lemans
- 1971 Pontiac Lemans
- 1972 Pontiac Lemans
GMC
Sprint
- 1971 GMC Sprint
- 1972 GMC Sprint
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