It is an auto with 4.10 gears.
My 08 was an Auto with 35 Km2's, full Rockhard skids, Mopar front and rear bumpers, plus a winch, so it was a heavy Jeep. I ran the Tera 2.5 kit with a 3/4 spacer up front, upper and lower control arms in the front as well as an adjustable track bar in the front. It lugged quite a bit on hills and it downshifted a lot on the highway just to hold a steady speed. I had a programmer and changed the setting for the 35's, didn't help much at all. It was OK to say the least but a little more gear would have been nice. I compared this to a JK on 37's with a 6 speed, running a 4.5 BDS kit, bumper, no skids. I thought the difference was night and day, I didn't see a need to change the gears on the 6 speed to keep up with traffic. It was an interesting comparison, I just felt like the auto was working harder than the 6 speed.
I know have a 2 door with 33's, 6 speed trans, winch, engine skid, etc, and see no need for gears with the 6 speed and 33's. Didn't notice much of a difference at all from stock performance, and I am getting an avg of 17 mpg with a high so far being 17.5 mpg. My speedo is dead on with my GPS.
So if you decide to go 35's which I totally think is the right look on the 4 doors, you way want to budget gears into your build. If you'd like something a little more mild, 33's would probably do the trick. OME or Tera both make great kit's I've tried both, I'm not running the Tera level kit with a slightly larger spacer up front to compensate for the winch weight.
Here's some of my JK's.
My first 2 door, 35's with the OME kit.
My 4 door, 35's with the Tera 2.5 Spring kit.
Sorry no pics of my new 2 door on 285 Duratrac's with the tera level kit, I'll work on that!