You haven't given much information on what your Jeep already has, other than 3:07 gears, so being specific is somewhat complicated. If moderate off-roading is the absolute most you will do, then a positive upgrade would be to swap from the Dana35 rear axle I'm almost sure you have, to a Dana 44. The next step would be to, if it doesn't already have, re-gear to 4:88's if your tranny is the Nv3550 5sp manual or if it is the 32Rle automatic, re-gear to 4:56's. You will be able to use the 27 spline front axle shafts after the re-gear, as you will still have the Dana30 front, but as you will be going to a Dana44 in the rear, Dana44 axles will need to be used.