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Unread 07-16-2013, 09:54 AM   #1
TexasPigHunter
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1993 YJ Wrangler 
 
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AX15 questions

I had my AX15 rebuilt in December 2011. I could tell afterwards that it was very tight and would grind when going into second gear. I figured I would drive it for a few hundred miles and it became a lot easier to shift. I also noticed that when it was easier to shift it was 90-100+ degrees outside. We had a crazy cold front come through Texas this week dropping temps to 70's. Now the trans is starting to grind a little again. Should I do a gear oil change? What gives? Not sure why the lower temps affects it so much.

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Unread 07-17-2013, 05:18 PM   #2
Holder350
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They probably filled it with gear oil. OEM recommends 10w30.
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95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
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Unread 07-18-2013, 06:17 AM   #3
PolloLoco
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I agree with the gear oil diagnosis, I found that out the hard way myself. From my research I've found that Redline MT-90 (GL-4) is a highly recommended fluid by other Jeepers and I myself run it and fully recommend it to others. Change it ASAP as it is not playing nice with your synchros and it will shift worse in cold weather. Chrysler did start recommending 10W30 due to availability of compatible fluids. Do yourself a favor and get some Redline MT-90, four bottles will do as the AX-15 requires 3.25 quarts:

http://www.amazon.com/Red-Line-Trans...&keywords=mt90

While you're at it order this pump too, it makes life easier:
http://www.amazon.com/gp/product/B00..._ya_os_product
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Unread 07-18-2013, 06:38 AM   #4
PolloLoco
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An interesting read:
http://www.widman.biz/uploads/Transaxle_oil.pdf

BLUF: gear oil is engineered for gears, not transmissions, and GL-5 is not a replacement for GL-4.
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Unread 07-18-2013, 12:59 PM   #5
Holder350
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Gear oil is also not recommended for yellow metals anymore, this includes brass, copper, or bronze.

I usually use motor oil or ATF depending on manufacturer's recommendation.

Sent from my phone
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95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
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You can tell the character of a person in how they treat someone who can do nothing for them.
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Unread 07-19-2013, 10:44 AM   #6
chappytx
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I had a problem when I put in GL-5. It is not compatible with the AX-15. The best oil I found is Redline MT-90.
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