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Rears up front by themselves won't gain lift. Most need to increase by adding additional leaves to the pack along with longer shackles. You need to watch out with the shackle though. Too long and the angle starts to reach 90 degrees. 45 to 60 degree shackle angle works good. Plus, not all rears are the same. The common length I believe is 47", measured along the arch from eye to eye. Some older ones had the center pin located further forward gaining firewall clearance and steering interference. Later ones (I'm thinking 89 and up) had 52" rears. These flex like mad but it's major work to take full advantage of these.
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