since no one else is jumping in here. Go by this chart to tell you what to change your gears to. I'm guessing you have 3.73's? 4.10 will help, but think about what your future plans are. If you plan on wheeling with bigger tires you may wanna wait and gear higher, because gear swaps are expensive when you pay someone to do them. If you are paying a shop to do it and buy new parts you are looking at about 400-450 in parts (Gears/shims/seals/bearings etc Front AND Rear) and typically people charge between 4-600 dollars labor to install.

http://www.quadratec.com/jeep_knowle...article-26.htm