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Old 04-05-2014, 05:42 AM   #1
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ax5 or ax15 ?

I have a 94 wrangler 4.0 with a ax5 gearbox witch is on it way out . I also have a 89 wrangler with a 4.2 witch has a ax 15 . Im think swap but not sure of a couple things .
1 well the bellhouse from ax5 fit ax15?
2 are shafts diffrent ?
3 transfer case are they enter changeable?
4 witch tran is better over all ?
5 any parts needed ?
I been online and found a mix bag of witch transmission was better I just want the best all around . Found that alot of jeep guy with 4 bangers where switching to ax15 . Is the inter slave better then external ? Well I am out to my jeep bone yard to retrieve said ax15 . Please if any one can help me with these ? Would be a big help . Thanks !!!

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Old 04-05-2014, 06:49 AM   #2
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If your jeep is a 94 4.0, then it has an AX-15 behind it unless someone downgraded it. The AX-5 was paired with the 2.5L.

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Old 04-05-2014, 06:54 AM   #3
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make sure 4 wh drive shifter bracket has same bolt pattern!been there done that!AX 15 housings can be different!
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Old 04-05-2014, 07:03 AM   #4
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Old 04-05-2014, 07:22 AM   #5
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as noted the 4.0L came with the AX15 and its far better than the ax5. you will want an external slave unit as you can replace that part with less work than the internal.. cuz its not inside the trans. However i think the external started to be used in 94 and up ax15's so check on that date. The t-case in the 94 is a np231.. unless something is wrong keep it, its a good case. Also you might want to check the trans in your 89 it could be the crappy ba10.
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Old 04-05-2014, 11:24 PM   #6
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Well my Jeep is a 1994 Sahara the tran has a tag say Nov.93 . I got the jeep from a family that I take care of their estate . I ben take care of it from brand new . The 5ran is a ax5 not sure why it was load ac the works. The 89 I bought from a good friend and I drove it home but planing to rebuild the ax15 first . I just rebuit the ax5 do to it was giving me problems after I lefted and rebuilt the transfer case . Add a slip yoke eliminater kit . Add body armor and external roll cage . 5 gear just does not have any go on highway . Find myself shefting to four to pass or on hills . So im thinking I well rebuild ax15 and use it but not sure if it a better bet . As I stroked motor and cam kit was add . Can I swap bell houseing ? Again I just rebuilt ax5 and its go but still no power in 5 gear .
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Old 04-07-2014, 05:37 PM   #7
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Well dude, in other words you have a 94 Sahara with a 4cyl in it. In your 1st post you said a 4.0, which threw everybody off, because a 95 4.0 came from the factory with an AX 15 and an external slave unit on it.

You are very contradicting in your posts. 1st post says the trans is "on its way out" this post says you rebuilt the trans and t-case.

Your biggest problem is the 4cyl, for having to pass or shift on hills, the only time you get any performance from a 4cyl is either when its on stock tires, or in low range for off road. That's it. No other happy mediums. Can't have the 4cyl and bigger tires or the 4cyl and good power. They just don't go together.

Switching to an AX15 isn't going to change the performance issue at all. The gear ratios in both are close, so the change isn't going to be noticeable.
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Old 04-07-2014, 08:38 PM   #8
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Old 04-07-2014, 09:35 PM   #9
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Ok I am sorry I am just as confused . So from the beginning I had problems with my 94 Jeep wrangler and yes iit has a AX15 I took it to Aamco annd they rebuilt tran about 2 years ago . Now the problem has started again . 5 gear has no power . So I now have 5 parts jeeps so I was asking which was better. I now see that the AX15 is the tran . So I have a 89 yj that has a good AX 15. It just looks so diffrent I was not what it was going to take to make it fit or would it fit as it was 4.2 and I have a 4.0 . I know what I was typing was confusing but I am just as confused as my tran looks nothing like any of the Jeeps I have or any of the photos online . I drain the oil and it was full of brass . (BAD!) So should I rebuild it or would it be easyer to put 89 yj tran in it. I just dont know .
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Old 04-07-2014, 10:02 PM   #10
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The Sahara only came with a 4.0 if I remember correctly The only way an AX15 would lose 5th is if it ran like 38"+ tires on the highway and the owner floored it. More info is definitely needed.
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Old 04-08-2014, 11:47 AM   #11
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Reading this thread with much interest. New guy here with a recently purchased 91 Wrangler. It has a 4.0 but did a VIN look up and turns out it was originally a 2.5l. How do I find out if the tranny and or transfer case were also swapped? Thanks!
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Old 04-08-2014, 12:21 PM   #12
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Originally Posted by EZRockinRick View Post
Reading this thread with much interest. New guy here with a recently purchased 91 Wrangler. It has a 4.0 but did a VIN look up and turns out it was originally a 2.5l. How do I find out if the tranny and or transfer case were also swapped? Thanks!
Simple a 4 cyl tranny will not bolt to a 6 cyl and a 4 cyl transfer case will not bolt to a 6 cyl tranny without changing the input shaft.
So the odds are if you have a 6 cyl then its all 6cyl stuff.
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Old 04-08-2014, 01:02 PM   #13
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The ax5 is a light duty trans. I don't even think a bellhouse exists that would let you bolt it to any 6cyl. I could be wrong though.
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Old 04-10-2014, 12:14 AM   #14
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Simple a 4 cyl tranny will not bolt to a 6 cyl and a 4 cyl transfer case will not bolt to a 6 cyl tranny without changing the input shaft.
So the odds are if you have a 6 cyl then its all 6cyl stuff.
What would need to be swapped out besides input shaft change on my NP231 to bolt up an AX15 to my 4 banger? I'll be moving to a diesel in the future but I think my AX5 is on its way out. If i can swap in an AX15 to hold me over until a motor swap I'd be a happy camper. If i pick up an AX15 with bell housing and the correct spline input shaft for the Tcase... will I be all set? Or will I have to do some shifting around to to tranny length or other concerns I'm unaware of?
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Old 04-10-2014, 10:13 AM   #15
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What would need to be swapped out besides input shaft change on my NP231 to bolt up an AX15 to my 4 banger? I'll be moving to a diesel in the future but I think my AX5 is on its way out. If i can swap in an AX15 to hold me over until a motor swap I'd be a happy camper. If i pick up an AX15 with bell housing and the correct spline input shaft for the Tcase... will I be all set? Or will I have to do some shifting around to to tranny length or other concerns I'm unaware of?
Dodge Dakota bellhouse, shorter rear driveshaft, longer front driveshaft, 84 camaro clutch, new pilot bushing. Well cost you about $1000 total. I have a shorter rear shaft for an ax15 in a 4cyl if you want one cheap.
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Old 04-10-2014, 10:22 AM   #16
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Dodge Dakota bellhouse, shorter rear driveshaft, longer front driveshaft, 84 camaro clutch, new pilot bushing. Well cost you about $1000 total. I have a shorter rear shaft for an ax15 in a 4cyl if you want one cheap.
and I have a Dakota bell housing if you want one of them cheap.
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Old 04-16-2014, 02:24 AM   #17
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Ok I am rebuilding transmission my ax15 was distroyed thanks to the Aamco clutch job never put shifter seal on . Off roading in the sand add a little winter salt and some highway driving well it made a mess of things water was mix in as well 5 gear syncro was not grabing all the way and some teeth got knocked of of something . Still elbow deep . I got a master rebuild kit and some gears coming as well as the 5th gear upgrade kit ..
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Old 04-16-2014, 02:32 AM   #18
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Here the gear oil looks like peanut butter smells like paint thinner..

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Old 04-16-2014, 02:34 AM   #19
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The brake down

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Old 04-17-2014, 06:49 AM   #20
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its really kinda a fun tranny to work on if you have all the tools and a good way to hold that center plate.
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Old 04-17-2014, 12:55 PM   #21
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its really kinda a fun tranny to work on if you have all the tools and a good way to hold that center plate.
It really is! I had never rebuilt a transmission before when I did my ax15. It was quicker and easier than I thought.
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Old 04-17-2014, 10:38 PM   #22
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Hardest part is waiting on parts!!! They have begain coming still waiting on fourth gear...
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Old 04-18-2014, 05:57 AM   #23
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Hardest part is waiting on parts!!! They have begain coming still waiting on fourth gear...
In one of you earlier posts, you mentioned a fifth gear upgrade kit. Just out of curiosity, what is the kit exactly? I've never heard of it..
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Old 04-19-2014, 12:19 AM   #24
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It a better sencro and high out then original I as a transmission shop and they told me that the 5 gear up grade is for bigger tires and would give me better performance on highway with big tires ..when the show up I well post the photos and part # ..
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Old 04-19-2014, 07:16 AM   #25
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It a better sencro and high out then original I as a transmission shop and they told me that the 5 gear up grade is for bigger tires and would give me better performance on highway with big tires ..when the show up I well post the photos and part # ..
This a speciality off-road or jeep shop you went to?
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Old 04-19-2014, 06:52 PM   #26
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It a better sencro and high out then original I as a transmission shop and they told me that the 5 gear up grade is for bigger tires and would give me better performance on highway with big tires ..when the show up I well post the photos and part # ..
Cool thanks Dude
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Old 04-22-2014, 04:15 PM   #27
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Dodge Dakota bellhouse, shorter rear driveshaft, longer front driveshaft, 84 camaro clutch, new pilot bushing. Well cost you about $1000 total. I have a shorter rear shaft for an ax15 in a 4cyl if you want one cheap.
My driveshafts should be good actually. With my current lift I am stretching my rear shaft too far but they are both custom shafts so I didnt want to ditch them if i didnt have to. Front shaft has plenty of room to move so I am good there as well. Will the Dakota bellhouse allow me to avoid an adapter kit? Why the 84 camaro clutch instead of stock AX15 clutch? Also pardon my lack of knowledge but what is the pilot bushing?

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and I have a Dakota bell housing if you want one of them cheap.
PM the price shipped please? Where are you located? If you plan on going to Jeep Beach then ill be there and we could do a swap
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Swap to a 4BT diesel in the future? Most likely.
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Old 04-22-2014, 04:17 PM   #28
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My driveshafts should be good actually. With my current lift I am stretching my rear shaft too far but they are both custom shafts so I didnt want to ditch them if i didnt have to. Front shaft has plenty of room to move so I am good there as well. Will the Dakota bellhouse allow me to avoid an adapter kit? Why the 84 camaro clutch instead of stock AX15 clutch? Also pardon my lack of knowledge but what is the pilot bushing?

PM the price shipped please? Where are you located? If you plan on going to Jeep Beach then ill be there and we could do a swap
Regardless of stretching, you will need a news front driveshaft. The Bellhouse is a couple inches longer. You will have zero room for it to extend, if you get it bolted up.

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