The Detroit Speed Mini-Tub Leaf Spring kit accommodates wider tire and wheel packages. The spring rate is 150 lb/in, and they lower your car 2-inches from stock. Our leaf springs are superior to others because of the great handling without sacrificing ride quality. In addition, the spring is biased, so the front spring section controls the spring wrap during hard load conditions. The springs have a tapered leaf with an anti-friction pad between each leaf to help provide a smooth ride. Consider these upgrades when compared to other leaf springs. This complete Detroit Speed rear Mini-Tub Leaf Spring kit includes all the necessary parts for a complete project package. The following fuel tanks are required for the Chevy II leaf spring kits: PN: 080191DS - Carbureted PN: 080192DS - Fuel Injected