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Old 12-10-2011, 12:12 AM   #1
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Exclamation AX 15 Tranny

Over the last year my tranny would grind when I down shifted into 3rd, wasn't a big grind just a small connection of gears.

This last two weeks especially when its cold, I have to force it into gear other wise it likes to pop out of 2nd. And the gears will not slow down or stop when downshifting, even after double clutching and triple clutching.

If anyone knows if its as simple as a small rebuild or just scrap it and buy a new one let me know. College Student so trying to do it right for a good price.

Info 1995 Jeep Wrangler Yj 4.0L AX-15 Transmission 5 speed manual.

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Old 12-10-2011, 12:53 AM   #2
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I found a used AX5 for mine on craig's list for $150.00 from a 2000 TJ for my 92 YJ. Had to swap the bell housing from the 92 to be able to use it. And now I have an extra transfer case. Now all 5 gears work.

If your pressure point when you come up on the clutch is near the floor this may point to air in the hydraulic clutch linkage. The pressure point should be approximately 2/3 of the distance of full travel of the clutch pedal from the floor.

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Old 12-10-2011, 12:54 AM   #3
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Old 12-10-2011, 02:10 AM   #4
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I have an AX15 4WD thats grinding ohhhh 4 years now... Believe its the syncros...They are NO GOOD! You have to shift at somewhat of a lower rpm and find the sweet spot sometimes you wont always grind. Im around 170 000 so its been pretty my bullet proof. Run it into the ground but try to find a deal on one thats been rebuilt for the future. I was going to actually look at a 91 AX15 and put it into my 92 tomarrow when I just found out the input shafts are different sizes!!! I dont know if I can now??? Anyone know? Check my post AX15 "NEEDS KNOWLEDGE" for sizes.
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Old 12-14-2011, 02:18 AM   #5
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The other day I finally figured out how to drain the tranny, i'm 19 and learning as I go and am also in college. Turns out, it was basically a mixture of water and whatever the previous owner had in there when I bought it. Have no clue the last time it was changed or anything. I flushed it out as well as I could, and added some Lucas tranny slip stuff from the store and it called for a 15W-40. Shifts much better now and smoother but does still grind in most of the gears on the downshifting.

From what I can tell is it does seem very bullet proof. I do jam those gears in there and nothing seems to be changing the the department of getting worst.

My question now is does anyone advise just for me to rebuild or buy a new one or upgrade, and if so to what model.

Thanks, and please let me know what you think.
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Old 12-14-2011, 06:59 AM   #6
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There are companies that rebuild the AX-15 for around $750 with a core charge. Basically run your tranny into the ground and then get a rebuilt unit, change it out, and send your old one back.

Also, I am not a fan of using motor oil for gears. Motor oil vs Gear oil seems to be a common debate.
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Old 12-14-2011, 03:10 PM   #7
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Quote:
Originally Posted by guardian262 View Post
Also, I am not a fan of using motor oil for gears. Motor oil vs Gear oil seems to be a common debate.
Yeah it does, and then it goes into all the synthetic stuff as well. I only used it cause we have it on tap where I work so it was free. I was also told 90 is to thick for the AX 15 especially in cold environments. My source is very reliable. That's why I put the motor oil in.
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Old 12-15-2011, 02:22 PM   #8
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Originally Posted by Holeintwo360 View Post
Yeah it does, and then it goes into all the synthetic stuff as well. I only used it cause we have it on tap where I work so it was free. I was also told 90 is to thick for the AX 15 especially in cold environments. My source is very reliable. That's why I put the motor oil in.
I would like to see a service bulletin where one of the engineers from CHRYSLER is recommending motor oil for the manual transmission.
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Old 12-18-2011, 12:16 PM   #9
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Ive looked into what gear your suppose to use in that trans, seems like quite a debate for sure. The dealer will tell you what it calls for but its not right! Look into using Royal Purple gear oil thats what I found your supposed to run, not cheap either.
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Old 12-18-2011, 12:59 PM   #10
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Smartautoparts.com best I could find one for. But they use all new parts and upgrade the syncros. Also I have a two year warranty.

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