Undoubtedly, one of the easiest ways to get a little lift on your Wrangler YJ is with some extended-length shackles. The shackle is what allows the leaf spring to pivot as the suspension flexes. The factory shackles provide 4-inches of spacing between the frame bolts and leaf spring bolts, and since they are only attached at one side of each spring, this means that for every inch you extend them, the net height achieved is 1/2-inch. It is not advisable to install shackles that are more than 6-inches long. 6-inch shackles will net 1-inch of lift. Anything longer and you risk over-stressing the frame mounts.
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