If you stay under 31's you should not need gears. Some people will tell you you'll be ok with 31's and stock gears. I don't think so!! I did it and did not like it at all, it would barely do 60 mph and was geared way to high for any kind of trail other than a moderate 2 track. I would look into the 6.5 tcase gears. I did that with my 31's and loved it. That also gives you the ability to run something like 33's later on. check out the zuwharrie.com forum and search CJ/ RUF. I have this lift and loved it. Great flex, great ride and cheap if you do it yourself. And you can get some tsl's in 31's, I think they even make boggers.