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I added last two leafs from Excursion spring pack to the F-codes. F-codes are from 05-06 SD without the lower helper spring. I did not use the Excursion anti-wrap add on. If you don't add to the F-codes it will ride worse because the Ex is heavier in the rear. You also need the extra leafs to maintain ride height in the rear relative to the front end. There are pictures in my sig.
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