UMI Performance 64-72 GM A-Body 1in Lowering Spring Front - SetA 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 4050Fs are stiffer than stock to provide increased performance with decreased body roll and a lower center of gravity. These springs are suitable
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UMI Performance 64-72 GM A-Body 1in Lowering Spring Front - Set