leveling and tire size
You should be fine. I only have a 2" leveling kit on the front of my truck, and I'm running 315/70/17 Wrangler DuraTracs. Your overall diameter would be about .75" more, but mine are .80" wider. If you went with a 2.5" lift that would be more than enough. Truthfully, you wouldn't even need one for the rear.
I currently have 295/70/18 (34.57) Nitto Grapplers and they rub really good if I am at full turn. So I am actually taking them back on Monday to either get a wheel with an offset or a smaller tire size, I dont know yet. They were on the truck when I purchased it and I did not notice they rubbed during a full turn as I never had to turn 100% during my test drive. They also had installed the leveling kit before I purchased the truck. So their wheel/tire man called me and told me to stop in and he would make it right.
So using this calculator I see that your tire diameter would be larger than mine but I am not sure how wide the tire will become? I definitely want to know how it turns out if you get those. I will update what they do for me after Monday. I hope we get a new wheel with an offset and I dont have to downsize to much in a tire I only have 1500 miles on the tires right now so maybe they just get me a totally new set of wheels and tires?
Here is the website I used for the calculations.
http://www.carbibles.com/tyre_bible_pg4.html
So using this calculator I see that your tire diameter would be larger than mine but I am not sure how wide the tire will become? I definitely want to know how it turns out if you get those. I will update what they do for me after Monday. I hope we get a new wheel with an offset and I dont have to downsize to much in a tire I only have 1500 miles on the tires right now so maybe they just get me a totally new set of wheels and tires?
Here is the website I used for the calculations.
http://www.carbibles.com/tyre_bible_pg4.html



