Just got back from the dealer after getting them to re calibrate my Jeep from it's original 225/75/16 tires to the 255/75/17 set I have on there now. At first the service guy told me that they couldn't do anything but I told him I knew that they could and that they should fix it. I talked to the service department head and showed him using a tire and wheel calibrator online (shows if your speedo is off) how much mine was off. At this point the first service guy disappears and I'm left with the other. He sees that my speedometer is off and ask "can't you just drive slower to compensate?" I said no, calibrate my computer for the larger tires you put on there or give me my Jeep back so that I can do it myself somewhere else. He then walks into the area where all the Jeeps are being worked on and comes back saying that the guy was just finishing doing what I've been asking for and he's been telling me can't be done this whole time. The guy who re calibrated my Jeep was clueless of the conversation we were having and just walks in saying "your Jeeps all done!"
I talked to him for a few minutes to make sure he did what I brought my Jeep in for and he said "yes, it was easy..no problem". I have no idea why there was a disconnect between what seemed like everyone in that department on how and if this could be done for me Jeep. I won't be taking my Jeep there for anything in the future. The good news is that my Jeep is now calibrated for my larger tires and my speedometer is 100% correct.