I checked the clearance and I don't think I could posibly grind enough off the caliper without damaging the caliper. I will definetly have to get new wheels. In defence of CCP they did mention this in their instalation instructions. I'm asuming they must have run into this problem before I wish they could have given some specs on the back spacing and offset so I would at lease know what I'm looking for. If your thinking about installing discs on your truck and pricing out the cost you better add the cost of a new set of wheels to the project.