Clayton 3.5in HD Triple Rate Rear Coil Springs

COIL SPRINGS: Linear rate, dual rate, triple rate, what do you need? We use all three variants depending on the vehicle, height, and capacity requirements. Linear coils have a single spring rate and are evenly spaced from top to bottom, which makes for a great spring for most applications. The main advantage is that the coils don’t touch each other, leading to wear and tear and coil failure. The dual rate coil has a tight set of coils, usually at the top, and then the second set of coils with more traditional spacing below. Dual rate coils do not ride any better than single rate coils, despite popular belief. The first-rate is usually completely compressed and acts as a spacer, its purpose is to provide a longer free-length coil so, at maximum articulation, the coil doesn’t unseat. In most applications, including the front of our JL/JT 2.5” and 3.5” lift kits, the coils do not unseat, and there is a top post, and bottom bump stops present so coils cannot fall out even at max articulation. But in the rear, there is no coil post or lower internal retainer, and therefore a dual-rate coil is necessary, or in the JT’s case, a triple rate coil due to the additional cargo area and weight. All of our coils are powder coated black using a new SealKor finish which is a zinc-rich powder coat to help in the prevention of rust and corrosion.

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