I've got the stock 4:10's with 35" tires, very happy with them on the road, the pentastar has plenty of torque to turn them. Off road I'm usually in low range with the 4:1 transfer case I have never had any problems climbing either.
2013 JKU Rubicon - Commando
Teraflex 2.5" spring lift, Teraflex monster front and rear trackbars, G2 wheel adapters, Goodyear Wrangler MTR Kevlar 35 x 12.5 x 17, Superchips Flashcal, Warn Zeon 10, Smittybilt XRC bumpers front and rear with tire carrier, Metal Cloak Overland Fenders, Uniden Bearcat 980, Homemade side rails. 50" and 20" light bars and brackets.