I recently lifted my JKU 4" and went with 34ish" nitto MT's and was set on the 4.56 but my local 4x4 guy convinced me the 4:1 would be a better fit. He was right. Plenty of power through all the gears. You can accelerate through sixth on hills. Low 1 is absolute crawl. If you want PM me and i'll send you my mechanics #. He is a cool dude and can probably tell you where he got mine. Oh yeah, remember that you have to replace the carrier in the front when going from anything lower than 3.73 but that's not particularly pricey. It is time to think about some gussets and sleeves and lockers while its apart (which can be particularly pricey)