According to this - you have the NV3550 (if its a five speed?)
http://www.jeepforum.com/forum/f9/st...ations-452871/
Mt90 should be fine for it from what ive read as well. I have the nv3550 and had royal purple in it, now a castrol fully synthetic 75w90 that i found at supercheap... really like the shifts now - same if not better than the royal purple. It was $32 / litre so $60 total. I have read another option to the MT90 is Mobil 1 75w90. But i couldnt find hence went with the castrol.
Taken from a US Clutch replacement write-up, but with the ax-15:
"Don't refill the trans with the fluid recommended in the '97 owner's manual. DaimlerChrysler found out about a year after this was released that something in that compound caused pitting and premature failure in the synchros. An excerpt from another forum to back this up: "The 5 speed tranny uses brass synchros and the Owner's Manual says to use GL-5 gear lube. GL-5 has a sulfur base and will eat the brass." An alternative, Redline MT90 is recommended. We did a little research and learned that Mobil 1 75W-90 is equivalent to Redline MT-90, costs about the same and was the best stuff for the trans that was rated for this duty. Service manual calls for 3.3 liters. We used 4 because with the lube pump we used you can't drain the bottles completely anyway. It took 4 full bottles to get 3.3 in the trans. The remainder in each was consolidated into a single bottle and saved for next time we service our diffs. (NOTE: you need this pump - there is no room for a funnel or even to get the bottles up in tight clearance and you have to pump and pump and pump to fill the trans. A very tedious process when you're so close to finished.) "
The fill plug is on the side of the transmission. Note always make sure you can remove the fill plug before you drain the transmission - otherwise you will be stuck with a jeep with no transmission oil and hence undriveable.
Cheers, Will
Manual transmission fluid?
