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Unread 07-13-2013, 01:25 PM   #16
pete1991YJ
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Originally Posted by metalhead View Post
From talking to people at the jeep dealership I work at they say to use the 75w90 gear oil.
Are they saying to use that in a 1987 thru 1995 wrangler? Then they would be wrong. There was a wrangler service bulletin about this way back when, see my previous post.

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Unread 07-13-2013, 04:00 PM   #17
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Originally Posted by UltimatE View Post
Actually, I haven't heard good things at all about Synchromesh. And given that the cheapest 10w30 provides absolutely perfect shifting from 80* down to -10*F in my transmission, I don't see why spending any extra money would be worth it.

http://www.jeepforum.com/forum/f12/1...trans-1100022/

Multiple people in that one thread report issues running it.

Everybody has their own opinion on the internet, this happens to be mine. I read most of that thread, and really only saw one guy with an AX-5, complain that it shifted rougher. Most of all the posters, had AX-15's. From all the info I read way back in '06, when I was having trouble with my AX-5, there is a difference between the AX-5 and the AX-15. IIRC, the synchros in an AX-5 are made from a different brass, which is softer. It needs the additives to reduce wear. When I bought my Jeep back in '05, the synchros were shot. I replaced the oil with Pennzoil Synchromesh, and it immediately got better. But worn synchros are still worn synchros. So after a couple of years, I had the AX-5 rebuilt. I've put nothing in it but Synchromesh since then, and it hasn't skipped a beat. Well except for the time it popped the 5th gear C-clip. I can't blame that on the oil. When I drained it, there was virtually no brass residue in the case.

That's my story, and I'm sticking to it.
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Unread 07-13-2013, 05:38 PM   #18
metalhead
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We could not find any service bulletins. The techconnect dealer site does not even show a service or parts manual for 95 on back. We did look up the part number for the gear oil and as stated earier the number was superseded and the new number is for 10w30 oil. I still don't know what to use. I am a mechanic at a Chrysler.jeep dealership. The oldest wrangler I worked on was a 99. Being a mechanic my gut says to use gear oil in a manual trans. I guess when I go to fix the 5th gear problem in my ax5 whatever type of oil comes out is what will go back in. Or maybe if I have some time I will contact star tech and see what they say. There are too many opinions on this. some people like this oil or that oil but What is truly the right stuff?
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Unread 07-13-2013, 05:48 PM   #19
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Originally Posted by metalhead View Post
We could not find any service bulletins. The techconnect dealer site does not even show a service or parts manual for 95 on back. We did look up the part number for the gear oil and as stated earier the number was superseded and the new number is for 10w30 oil. I still don't know what to use. I am a mechanic at a Chrysler.jeep dealership. The oldest wrangler I worked on was a 99. Being a mechanic my gut says to use gear oil in a manual trans. I guess when I go to fix the 5th gear problem in my ax5 whatever type of oil comes out is what will go back in. Or maybe if I have some time I will contact star tech and see what they say. There are too many opinions on this. some people like this oil or that oil but What is truly the right stuff?
10W-30

Quit over-thinking it.

I rebuild 5-10 AX-5 & AX-15 transmissions per month in my "Jeep only" shop. ALL get motor oil.

Max
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Unread 07-13-2013, 05:50 PM   #20
ashland82391
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Quote:
Originally Posted by metalhead View Post
We could not find any service bulletins. The techconnect dealer site does not even show a service or parts manual for 95 on back. We did look up the part number for the gear oil and as stated earier the number was superseded and the new number is for 10w30 oil. I still don't know what to use. I am a mechanic at a Chrysler.jeep dealership. The oldest wrangler I worked on was a 99. Being a mechanic my gut says to use gear oil in a manual trans. I guess when I go to fix the 5th gear problem in my ax5 whatever type of oil comes out is what will go back in. Or maybe if I have some time I will contact star tech and see what they say. There are too many opinions on this. some people like this oil or that oil but What is truly the right stuff?
Your "star tech" may even say use gear oil. I have a master mechanic in the family and that's what he said to put back in it.

The fact is gear oil sucks in the ax5, I know first hand. After I put quakerstate fill synthetic 10w30, doesn't have to be synth, it was a whole new trans and I haven't looked back.

Those are the facts.
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Unread 07-14-2013, 07:50 AM   #21
Lemoore-on
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Put 75-90 in it. Come back in a year or two and tell us what a POS your AX5 is......
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Unread 07-14-2013, 08:24 AM   #22
OKwranglerYJ
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Here is what you should do. Go but a brand new ax-whatever and see what the little tag on it says to put in it.
I had this discussion with a guy and still he said he was going to use gear oil. After a couple of days he got in his new ax-15, and the tag said don't use gear oil, use 10w-30.
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