Air Lift Loadlifter 5000

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Hey guys, i just got my Loadlifter 5000 for my GMC Sierra Half Ton Crew cab today, and attempted to put it on, but we set it in place on the leaf spring,and put the tire back on just to see if it was rubbing, and it did. the guy from airlift said it would fit on my truck, thats why im confused, did i order the wrong one? my part number is 57215, did i order the wrong one? anyone else have this problem? my tires are stock size, i have goodyear wrangler duratracs, but they are not any wider then what comes stock. thanks!