Ive been told I can do a rubi crawler, but the rubicon already has a 4:1 tcase. Unless you’re doing a dedicated crawler I personally don’t see a need for that. Now if it doesn’t have the 4:1 case, then I would do that for sure.
I still have a '97 TJ with the old AX15. While it's not unbearable it is definitely not as great as the later 5 speed in the '00 to '06 TJ I believe.
Actually, I have the AX15, in my YJ. And, a freshly rebuilt NV3550, in my TJ.I would get a manual and one that is on a 2000 or newer TJ as it will have the NV3550 instead of the old AX15