Hello Knot... I have the same year TJ and we both have the AX-15 5-speed transmission.
I heartily recommend using Redline's MT-90 in the AX-15. You can pick it up at Summit Racing's website and you will need at least 3.3 quarts.
'97 moss pearl green TJ, 4.0, 5-speed, 3" Teraflex coils +1.5" spacers, Super35 w/ Superior 30 spline shafts, ARB and ZJ disc brakes, Dana30 w/ ARB, 4:10s, AA SYE w/Teraflex shaft, BDS upper/lower control arms, Rusty's HD tie-rod, JKS quicker disco's, Poison Spyder steering box skid, Riddler diff covers, 35x12.50 MTZs on Eagle alloys, Warn M8000 winch, NoLimits4X4 stinger/rad hoop, SRC rockers, Bestop tire carrier, Raingler nets, yada yada...
It's a good life. My wife doesn't look under my Jeep and I don't count her shoe boxes...