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Old 06-18-2012, 04:48 PM   #1
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ax-5 tranny question

I have replaced the clutch, flywheel, throw out bearing and im still grinding going in gears if I shift too fast. I called the previous owner and he told me he put 10w-30 oil in the tranny so I drained it and put 75w-90 gear oil and it seems to have help a good bit. I have been told its synchros though. Is it cheaper to replace entire tranny or rebuild? synchros are above my level of comprehension in repair. How long do I have until the tranny is totally shot? any help would be appreciated

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Old 06-18-2012, 09:18 PM   #2
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If you are going to replace it, go with an AX15. I did it myself and would never even consider an AX5 for anything again. As far as the Syncros you have, it all depends on how much you beat on it on how long they last. If you are slamming it into gears and already have damaged speedos they wont last long. Also, the fluid you put in it is pretty much the same weight as the fluid the PO had in it They are measured using different scales and are almost identical. What matters is if synthetic was in it or not. Regular dino oil eats up the synchros since they are made of brass. Synthetic makes them last much longer. The thing is if they are already damages and you are slmming it into gears they are near the end of their lives. Once the teeth are gone so are the gears behind those synchros.

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Old 06-18-2012, 09:20 PM   #3
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If you are going to replace it, go with an AX15. I did it myself and would never even consider an AX5 for anything again. As far as the Syncros you have, it all depends on how much you beat on it on how long they last. If you are slamming it into gears and already have damaged speedos they wont last long. Also, the fluid you put in it is pretty much the same weight as the fluid the PO had in it They are measured using different scales and are almost identical. What matters is if synthetic was in it or not. Regular dino oil eats up the synchros since they are made of brass. Synthetic makes them last much longer. The thing is if they are already damages and you are slmming it into gears they are near the end of their lives. Once the teeth are gone so are the gears behind those synchros.
no slamming in gear im being very nice to the old jeep... does the AX15 bolt right up with no mod?
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Old 06-18-2012, 09:30 PM   #4
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I think you might need a adaptor plate.. and get a 94 or newer as those have the external slave.
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Old 06-18-2012, 09:45 PM   #5
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Originally Posted by OverkillYJ View Post
If you are going to replace it, go with an AX15. I did it myself and would never even consider an AX5 for anything again. As far as the Syncros you have, it all depends on how much you beat on it on how long they last. If you are slamming it into gears and already have damaged speedos they wont last long. Also, the fluid you put in it is pretty much the same weight as the fluid the PO had in it They are measured using different scales and are almost identical. What matters is if synthetic was in it or not. Regular dino oil eats up the synchros since they are made of brass. Synthetic makes them last much longer. The thing is if they are already damages and you are slmming it into gears they are near the end of their lives. Once the teeth are gone so are the gears behind those synchros.
Could you tell us what is needed and what has to be done to run the ax15 behind the 2.5 instead of the ax5?
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Old 06-18-2012, 10:27 PM   #6
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You can use a bellhouse from a dodge dakota. The put an ax15 behind the same 2.5 other discussions will tell you what years because i forget. You will need to change the pilot bushing depending on what year ax15 you get. You will need a new clutch from advance adapters. You will need to change the input shaft on your np231 to match the output of the ax15. You will need to have the driveshafts resized because the new bellhouse is 2" longer and will change the length. I think that is all. And def make sure to go with external slave setup. If yoi have that already the same slave will work. I think thats it. Cost me about $600 to do myself. Transmission is now indestructable behind a 2.5. It will handle a v8 if i ever go that route as well.
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Old 06-18-2012, 10:42 PM   #7
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Or a cheap route , go to a pull n' pay yard and get another AX5 from a 4cyl cherokee. They go for about $150 in my area. Will work for awhile I would imagine. You have already spent the money on the clutch stuff. Did you do the work yourself? I wheel regularly in the Rocky Mountains w/ my 4cyl, 31's, and have had no issues with my ax5, not really sure why they get such a bad rap.
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Old 06-19-2012, 10:35 AM   #8
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I have 31's on my YJ and 5th gear crapped out twice. The ax5 will give you problems in lower gears as well if you go over 31". After the second time i just put in an ax15 in. With the ax15 i can put on 35" if i want.
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Old 06-19-2012, 11:52 AM   #9
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I am going to do this first. Before I put a 4.0 in my jeep. The ax5 is just weak. Reverse always grinds. Second gear likes to pop out going down hill coasting if it's bumpy. The ax15 is a tough tranny and will handle anything I mean anything a 2.5 throws at it. My buddie has a small block behind his ax15. His motor has around 300hp. Never seems to get hot either
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Old 06-19-2012, 06:07 PM   #10
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Or a cheap route , go to a pull n' pay yard and get another AX5 from a 4cyl cherokee. They go for about $150 in my area. Will work for awhile I would imagine. You have already spent the money on the clutch stuff. Did you do the work yourself? I wheel regularly in the Rocky Mountains w/ my 4cyl, 31's, and have had no issues with my ax5, not really sure why they get such a bad rap.
Yes I did the clutch myself, but I have been told if you dont know transmissions dont try synchros yourself, I am worried that any day it might decided not to go in gear... I have not tried to go off road in this jeep yet cause it still needs alittle love before I take it out. so the tranny out of a cherokee 4cyl will bolt up? are they cheaper than the AX5 out of the wrangler? I have no idea what to do yet.... swap, new, rebuild, AX15, AX5, NV3550 not a clue but I need to start making some decisions.
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Old 06-19-2012, 07:05 PM   #11
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As you can tell the concensus is that the AX-5 is a P.O.S. and I agree. Had the same setup as you, 2.5L on 31's. If a transmission can't hold a 4cyl that is a pretty weak transmission. My resolution was to build a transmission to hold a V-8, I took the SM-420 Novak conversion route. I am sure you will make the right decision that is right for your Jeep. IMO, don't spend anymore money on an AX-5. My solution cost a little money, about a K, but well worth it after all was said and done. I bet if you research you can find a reasonable AX-15 or a different solution to your transmission woes.
Now if my tough, little, underpowered 2.5 will ever give up the ghost I am ready, but until then......
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Old 06-19-2012, 07:16 PM   #12
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Which swap is the easiest or most affordable?
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Old 06-19-2012, 08:52 PM   #13
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Ax15 is easy. I paid $190 for mine on craigslist. Runs great. I had to drive an hour and be patient for a cheap one to pop up, but those deals are out there.

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