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. Our springs are wound from 5160 CrSi premium wire and feature a linear 530 lb/in rate. The 4050F's are stiffer than stock to provide increased performance with decreased body roll and a lower center of gravity. These springs are suitable for Auto-x and Pro-Tour applications as well as corner carving/cruising. The ride height is engineered for a 1 Lowering with standard SBC, aluminum head and intake Big Block and Pontiac 400 as well as LS power (lightened cars may require spring trimming). The 4050F's are also suitable for full weight Big Block applicnose down rake is desired. They have a tough black powder coat finish and UMI proudly manufactures these premium quality springUSA.
As an industry leader in the muscle car suspension industry, UMI is proud to bring you the best spring in the business.
Consistent rates and only the best materials (premium Chrome Silicon wire) ensure your cars sits properly for years to come.
Linear spring rates (530 lb/in front, 130 lb/in rear) provides a firm yet comfortable ride and incredible handling.
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Make Vehicle | Model | Year |
|---|---|---|
|
1967-1972 Buick Skylark |
Skylark | 1967-1972 |
|
1967-1972 Chevrolet Chevelle |
Chevelle | 1967-1972 |
|
1967-1972 Chevrolet El Camino |
El Camino | 1967-1972 |
|
1967 Chevrolet Malibu |
Malibu | 1967 |
|
1970-1972 Chevrolet Monte Carlo |
Monte Carlo | 1970-1972 |
|
1967-1970 Pontiac Tempest |
Tempest | 1967-1970 |

UMI Performance is an aftermarket company that specializes in building high-quality suspension parts. But before they were known as a suspension manufacturer, they manufactured precision parts for major brands such as Corning Asahi, Sony, and Bell+Howell. They may have shifted industries, but their dedication to creating quality products has remained the same.
Quality Products Made In The USAAll of their products are made in-house, which allows them to control every aspect of their products. 100% made in the USA, they can maintain their high standards and create suspension parts that can tackle any street, whether it be the fast corners of a race track or the bumpy road to your grocery store.
Parts Bred From The RacetrackUMI Performance actively participates in various racing disciplines since most of their product engineers and sales team are racers. Because of this, they can test their products through real-life racing scenarios, which helps them gather data that can help improve their products.
Easy To Install PartsEach product is designed to replace factory-installed parts without any significant modification. It is carefully measured to ensure that it would fit perfectly into the vehicle and comes with a step-by-step instructional manual, giving their customers a hassle-free installation experience.
Purchase UMI Performance At Vivid RacingIf you are in the market for high-quality suspension parts for your vehicle, then look no further, as UMI is the brand for you. To know more about UMI, visit Vivid Racing and check out their list of products that fit your specific need.
Click to view the Installation Instructions here