Easy peasy. If you're never going to wheel it or disconnect the sway bar, you can probably just throw on the tires with a 1.5" spacer or new wheels with the correct backspacing. I've never done it myself, but I've seen it done. If you don't adjust the backspacing, the sway bar link will rub a 12.5" wide tire pretty badly on the inside sidewall - especially in the rear. You might have to trim the rear of the pinch seam a little bit - but I doubt it. Likewise adjusting your steering stops would be a good idea - but I'd wager you've already thought of that.
Other options would be a 2" spacer kit, or flat fenders.
ABS and traction control will be just fine without doing anything to it. The computer in the JK just monitors the four ABS sensors and measures the position of the steering wheel. As long as those five data points all sing in harmony, no traction control lights will come on.
To get your speedo and odometer working properly, AEV sells a simple unit that will let you change the tire size in the computer. I think it's $200. It will only work on one JK at a time - before it can work on your VIN, it has to re-set the VIN of the first JK it programmed to factory settings. You can also use it to change DRL settings, TPMS settings, idle settings, and a bunch of stuff I don't remember.
If it has an auto transmission and did not come with the 4.10's or 3.73's, you may find that it's going to be more than just a little bit sluggish - especially if it's got the 3.8 instead of the newer pentastar.
Topic: I need to fit 35's on a 2012 JK. (Read 1337 times)