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post #1 of 14 Old 07-16-2013, 09:54 AM Thread Starter
TexasPigHunter
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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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post #2 of 14 Old 07-17-2013, 05:18 PM
Holder350
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They probably filled it with gear oil. OEM recommends 10w30.

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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post #3 of 14 Old 07-18-2013, 06:17 AM
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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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post #4 of 14 Old 07-18-2013, 06:38 AM
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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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post #5 of 14 Old 07-18-2013, 12:59 PM
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.

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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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post #6 of 14 Old 07-19-2013, 10:44 AM
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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post #7 of 14 Old 07-08-2015, 08:01 PM
wadewen
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Tranny question

Hey guys, any thoughts on this:

I just got a 97 TJ with 4.0 and AX-15. Everything has been running very well, but there were some signs of lack of maintenance like plugs worn down to 0.045" gap.

This past weekend, I checked the fluid in the tranny, and it was very muddy looking. There were no issues with grinding or anything else. When I changed it, there were very small filings in the fluid. Nothing surprising.

Based on the feedback on the forum, I put in full synthetic 10W-30. Pennzoil because it was available.

After changing the fluid, it now grinds a little bit every time I put it in reverse. No other issues. Any thoughts on the reason for the grinding?

I plan on replacing the fluid again at the next oil change since it was so far gone. This time, I'll try the Redline that folks are also recommending. Any other advice.

Thanks for your time!
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post #8 of 14 Old 07-08-2015, 08:25 PM
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I'd replace it with Redline MT90 at your first available opportunity; I've learned that the AX-15 is a very picky transmission. As for the color of the fluid and fine metal shavings I've experienced the same with no issues.
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post #9 of 14 Old 07-08-2015, 09:20 PM
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That's good to hear. Thanks.
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post #10 of 14 Old 07-09-2015, 09:05 PM
200TjCrawler
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I've always used Dextron III. It's pretty good for manual transmissions.
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post #11 of 14 Old 08-03-2015, 07:14 PM
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As an update, I replaced the fluid tonight with the Redline MT-90. It does shift a more smoothly, but it still grinds going into reverse.

How critical is fill level. I filled until it seeped out the fill hole.

Also, my clutch engages fairly close to the bottom of the stroke (maybe 2" from the floorboard) so maybe that's the real problem, but I just chocked it off to every clutch being a little different.

Any thoughts? Thanks for your help.
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post #12 of 14 Old 08-03-2015, 08:57 PM
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I found another thread saying this is normal. Can others confirm?
Seems weird since there was no grinding w the old, muddy fluid
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post #13 of 14 Old 08-04-2015, 07:51 AM
StanF
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Quote:
Originally Posted by wadewen View Post
As an update, I replaced the fluid tonight with the Redline MT-90. It does shift a more smoothly, but it still grinds going into reverse.

How critical is fill level. I filled until it seeped out the fill hole.

Also, my clutch engages fairly close to the bottom of the stroke (maybe 2" from the floorboard) so maybe that's the real problem, but I just chocked it off to every clutch being a little different.

Any thoughts? Thanks for your help.
Grinding into reverse is normal - it does not have a synchronizer. Good practice is to put it in 1st gear, then reverse. That will help sync everything up and prevent grinding.
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post #14 of 14 Old 08-04-2015, 04:48 PM
wadewen
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Thanks, StanF. I'll give that a try.
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