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Leaf Springs Blocks

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The rear of the truck is lifted with blocks and retains the factory leaf springs. You can bet Nissan spent millions researching and testing spring rates, so leaving the factory springs in place in most applications is a good thing. The key to lift blocks is making sure they aren't too tall. Once they reach a certain height they become unsafe. The Trail Master blocks are made from quality ductile iron so reliability and safety are not an issue.