Rubicons have a NP231 with 4to1 or something just like it made for Jeep. It might have the the 4to1 but you can not twin stick it. I would start with getting a set of 5:13 gears then do the lowmax 3to1 later. Unless you want to save up your money and then invest in a 3 speed Tcase and then your done.
94YJ Tera low 4:1, 4:10's, HP D44 front locked, 8.8 rear locked, 37" Truxus M/T's, custom spring over front/spring under rear, along with other stuff (Trail rig)
00WJ open/open, lifted 31" MTR's (curbcrawler)
84 Toyota Pickup open front, welded rear, 63" chevy rear springs, propane injection, 37" mtr's, 4.7:1 Tcase
07 FORD E350 SD (TOW VAN)
Proud member of MARR (if you don't get it don't ask, it will ask you)