You'll break yer spindles if they don't have the reinforcement bracket that Tuff included with their later kits. You could spend some more coin if yer wanting bomb proof and buy their longer spindles. This will eliminate the spindle spacer. If you want to eliminate the coilover spacer, you'll need custom fabbed longer coilovers, probably something from King or SAW. I'd inquire about spring diameter of the 2" vs 2.5" coilovers you want. The more you crank up yer coilovers and the wider they are, there is a possibility they'll hit the spindle on full droop. This might be one reason why Tuff doesn't recommmend the combination. Jack up yer truck on the front and watch the tire droop and see how the coil approaches the spindle. It'll be considerably more exaggerated with a coilover cranked up 2.5". I wouldn't recommend going over 1.5".