Originally Posted by bill_de
How will you get a solid answer on the internet if you can't get it from your dealer? Seems a phone call to the shop who you plan on going to will give you a better idea. At least you know for sure who is giving you the answer.
If someone on one of the forums, has actually had success, with any manner of reprogramming for the tire size, then they could give me their first hand information.
A phone call to the shop will likely result in what others have heard. "Yes we can do it", but then when it comes down to it, they can't. On a wrangler they can, but a GC, all I've seen on forums is that they can't. There may be some other programmer or method I don't know about though.