I have 5.38s and 40s with an auto and a 3.8...wouldnt want to be any less geared at all! Mine is a 4 door with a matching spare and armor/skids/etc and the jeep lives between 7500' and 11000' of elevation at all times, all of which suck away the power pretty quick!.
They went on yesterday gearing is good for a daily driver very nice on the highway have not had it off road yet. I will have to trim up some sheet metal on the rear of the front fender as it looks like it will eat the tire when it stuffs.
...that and my jack is now worthless will have to build an extension or figure something else out.
My 2012 3.6 auto does great with 40s and 4.88s (d60s) but when I hit hills it struggles to keep gear and usually has to downshift. I notice the lack of power when the roads are not flat. Offroad it has been no issue due to the 4:1 tcase in my rubi. I actually get 15.2-16.1 mpg in town. If I had it to do over, I would have gone 5.13s.
gotta agree with that went 4 wheeling yesterday and no issues when the rubi t case is involved but getting there I noticed tranny staying in 4th, the OD never engages even on gentle inclines going 70 mph. Thats pretty annoying.
5.13 are going in soon as I'm back from vacation.
Also stuffed the rear tire into my wheel well sheet metal, will have to add about 3" to the rear bump stop pad.