Explaining Lift Kit Spring Rates
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Some interesting dichotomies spring up when comparing leaf springs with different arches. All other things being equal, if a leaf spring is reformed for more arch, the spring becomes stiffer as its arch increases. Because new leaf springs with high arches are also given more length to place the shackles at the proper angles, they are sometimes softer than the lower-arched springs. Flat leaf springs are considered more desirable than high-arch ones for suspension flex because they let the axles droop equally as well as they compress. You can see in the photo that the high-arch spring will not allow much droop, but that high-arch gives you the lift and clearance you want for larger tires to get over larger rocks. View Related Article
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