2015 wrangler sport
 

i have a 2015 sport automatic with 3:73 and would like to know what is the biggest tire it can handle with no issues?

You will need a programmer like the AEV pro all to adjust your Speedo and shift points. I ran 35's with 3.73's and she was a bit dogish.

"handle without issues" is all relative. The bigger the tire the more sluggish it's gonna be, even with a programmer. You get used to it as your own "normal", but it can wear you down over time. Keep in mind you'll also putting more stress on all your components. I ran 35s on 3.73 for a few years. It was bearable. I ran 37s on 4.10s for a decent while before re-gearing......I was thoroughly worn down in about a years time.