I have seen where guys upgrade the GMT800 trucks to the GMT900 front brakes. My question is twofold. 1. Are the '15+ brakes any bigger/better than ours and will they bolt up, perhaps with a bracket to move the caliper out??? 2. I was reading the GMT800 brake upgrade thread and read that the GMT800s run better rear calipers. If this is the case will the rear calipers bolt onto a GMT900 without much trouble??? I was looking at the '15+ section and read where someone said the brakes are 14" diameter but looking up the rotors for a '15 Tahoe I found conflicting info. Some said 13.5" some said 12.99". I am very content with the cross drilled and slotted rotors and ceramic pads I am currently running but I am always interested in upgrading where I can. I just hadn't seen any discussion about this being plausible so I thought I would get the conversation started. Any info is appreciated.