If you are going to the trouble of upgrading rear axle - the presumption is you are running bigger tires too.
Get a 4.10 geared 8.8 and find a factory front YJ axle from a 4 cyl geared 4.11. That will be decent gearing for anything from 32-35 inch tires. With 33's being about ideal.
1994 YJ Wrangler, 4.0, AX15, NP231, 35x12.50x15 BFG KM2s, 4" RC lift, 1" lift Boom Shackles, 1" BL, 4.10 gears, 8.8 LSD in rear and D30 Aussie Locker in front, on-board air conversion, Ramsey RE8000 winch.