I put Nitto terra grappler AT 34.5's on my 2012 w/ 3.21's and let me tell you it sucks now, definately need a regear. Tires only rub in the rear on big bumps with 4 people and some cargo in the jeep... would like to do a 1-2" lift, not sure what to do but that's another thread i guess.

 

I got the 3.21's with the stock 32's on my 2012 Arctic. This thing is a dog with the Auto-trans!

 

Liveable.

It was liveable for some with the old 3.8 and since you have the new "from the heavens" 3.6 saviour motor(cue the "AAAHHHHH" and music) you should be fine.