You can always upgrade gearing with out upgrading axles... Just depends on what you want to do. You can get 4.10 gears out of a 4cyl. wrangler or go higher and buy a ring and pinion set from quadratec or other various providers.
1995 YJ 5.9L Magnum, SOA, 2.5 in. Rugged Ridge Lift springs, 1 in. Lift Boomerang Shackles, 32 in. Kenda Klever MT Tires, G.E.A.R Seat covers, Rear mounted Jerry Can, Smittybilt SRC Sliders, Rear Bumper, and Rear Corner Guards with Flat flares, EAUTOGRILLES Front Flat Fender Flares, EAUTOGRILLES Stinger Bumper, Quadratec 9000 lbs. Winch.
2007 JK NEW 3.8L Motor, 4" Teraflex Lift, Fabfours Front and Rear Bumper, Teraflex Sliders, 35" Nittos