Swift Coil-Over Spring - Barrel Type - 2.5" ID x 12" - 125 lb. SSK They are especially recommended if

They are especially recommended if you are installing a subframe connector

6 Inch Long Porting Mandrel

Other colors available as well

The 4778 features a 1

Silverado 3500 HD 2017-2011

Swift Coil-Over Spring - Barrel Type - 2.5" ID x 12" - 125 lb. SSK They are especially recommended ifINCREASE TRACTION, LESS UN SPRUNG MASS, MORE STROKE, INCREASED HANDLING. THE ONLY THING YOU WILL BE LOSING IS TRACK TIME. Swift Springs manufactures springs with differing rates for a variety of circle track racing applications. With options for both dirt and asphalt tracks, Swift has a wide range of coil spring formats, including coil over, dual rate, bump springs, and more. Swift Springs superior engineering has provided the next generation of