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Would it be feasible to move my forward and aft shackle attachments forward 1.5-2 inches? (see new post) I know there’s not a lot of room to move the aft shackle before the frame starts to curve upward, but I could run a little longer shackle to keep the caster angle at zero and the longer shackle could also help with articulation.
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If you run a longer shackle on the rear of the spring, it will defeat the purpose of the shim. And that will bring you right back to where you began.