Originally Posted by GCM 2

Throw in an Atlas Rubicrawler and your problem may be solved, you get the added gear reduction when you want/need it and you get the option of doing it in 4 or 2 wheel drive. I have Pro Rock 60's with 5.38:1 gears, it's as tall (or low of gearing) as Dynatrac sells with the Pro Rocks so I would think that's all you can go for. Around town/hwy running 40"s, the 5.38's are fine, but on a few trails with steep sections, the stock trans and engine seem to be working harder than I would like them too. I'm going to do, at a minimum, the Rubicrawler addition or maybe just an Atlas T-case. If this isn't the route you like, you need to look at Ford 9" or a Corporate 14 bolt, for the taller than 5.38:1 selection. Currie Axles makes a Ford style 9" that is (I think????) compatible with the JK. The Corporate 14 bolt, well you are looking at custom builder territory there, but anything is doable.