I have seen lots of people say lots of different things about this so I pretty much ignored it, but I just rebuilt a 93 AX-5 and I don't EVER want to do it again. Does anyone KNOW what lube should be used? Not, "I heard...", or "This guy I know used to work for Chrysler...", but actually KNOW what the story is on this?!?!? I appreciate it.
I asked this same question myself when I had my AX-15 in my old YJ. From all the responses I got, I could only come to the conclusion that nobody has any clue as to the true answer. I got just as many people saying it worked great as those saying it would eat my synchros. You can do a search and you will probably come up with quite a few hits, including my discussion. Good luck!
One thing, my Chilton's manual said to use GL-5 fluid, but who knows...
If I remember correctly, there was a 1-2 year span when the tranny soft parts were made of a slightly differant alloy thereby necessatating a special lubericant. I can't remember who posted it(might have been Jaffer), but I believe that info from either an owners manual or FSM was put on here somewhere. Try a search, or call the dealer.
page 2 of the 1989 jeep service manual for the ax-15 reads as follows...
recommended lubricant: sae75w-90, api grade gl5
level: bottom of fill plug hole
capacity: 3.27 qts for xj, comanchee and yj 4wd models
3.32 qts for xj and comanchee 2wd models
if ya want a copy of this manual, i think i could manage a source for ya. just lemme know
The only year that I'm aware of the the AX15 needs a special lube is the 99. It requires GL-3. MOPAR gets $15/qt for it (synthetic). Since MOPAR uses Mobil 1 as it's synthetic oil ...I'd imagine that the GL-3 is Mobiltrans ..which is available for $110 for a 5 gallon bucket.
Apparently the phosphorus and sulpher does nasties to the soft parts.
Thanks for the input. I have the chrysler manual for my year (93) and it says GL-5. I just heard some people say that the manual is wrong. But don't you think Chysler would have issued a memo or something?!?!