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Old 02-15-2017, 12:43 PM   #1
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Rebuild Peugeot Tranny, or buy a new one? '87 Wrangler

Hello everyone,

A few days ago I was having issues shifting into gear. It got very difficult to shift into gear, and eventually it got to the point where I could not shift. I was afraid I'd damage something if I forced it.

I dropped it off to my mechanic and he says, based on how the shifter is behaving(it's stuck in neutral, dead center), I may have broken a shift fork, or worse something internal(I don't recall exactly what may have broken) may have failed.

If something internal did fail, he said I would need to have the transmission rebuilt. However, he said it would be cheaper to buy a new/used tranny for my Jeep.

I did a little research and I found out some people have replaced their YJ's Peugeot with an Aisin AX15. Many people say the Aisin is superior to the Peugeot tranny. What I would to know, if I were to get an Aisin AX15, would anything have to modified? Or would it directly mate with the 4.2 engine?

Would it be cheaper to just buy a rebuilt Peugeot, or an Aisin? What do you guys recommend I do?
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Old 02-15-2017, 12:51 PM   #2
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Go with the AX15 external slave. Since you probably don't have an NP231 transfer case (1987), you should try to buy the trans/TC at the same time from the same vehicle, otherwise you would have to possibly change out the input shaft on the TC to match the output shaft on the trans if you buy the NP231 TC separately.

Then do a web search for installing an AX15 into a 87 or 88' YJ, all of the info is out there. Not too difficult, but you will need to gather the correct parts.

Then....since you're doing that, you might as well do a SYE...... it never ends....

Where in SoCal are you located?

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Old 02-15-2017, 01:20 PM   #3
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Go to junk yard and get an ax15 and transfer case from a 97-2004 Dodge Dakota pickup 4x4 it is the AX-15 then just bolt in keep the transmission mount for your pegeuot because you will have to modify it to marry up with your belly pan.

Has to be 4x4 the AX-15 4x4 version has the right length output shaft and spline count. A 2wd one will be two long.

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Old 02-15-2017, 03:27 PM   #4
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External slave bellhousing is 1994 up to (I believe) 1999. maybe even newer.

Even if you end up with an AX15, I suggest that you replace the syncros. Most of the Jeep transmissions you find will have well over 100K miles on them and some will have a lot more.

Chief has a good suggestion about the Dakota transmission/transfer case. You might find a low mileage one.

Good Luck, L.M.
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Old 02-15-2017, 05:16 PM   #5
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^^^^ what they said...get an ax15 and np231...no way I would spend money on another BA-10
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Old 02-17-2017, 11:23 AM   #6
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Quote:
Originally Posted by Beach248 View Post
Go with the AX15 external slave. Since you probably don't have an NP231 transfer case (1987), you should try to buy the trans/TC at the same time from the same vehicle, otherwise you would have to possibly change out the input shaft on the TC to match the output shaft on the trans if you buy the NP231 TC separately.

Then do a web search for installing an AX15 into a 87 or 88' YJ, all of the info is out there. Not too difficult, but you will need to gather the correct parts.

Then....since you're doing that, you might as well do a SYE...... it never ends....

Where in SoCal are you located?
Thanks for your reply

I believe my '87 has the NP207. I'm not mechanically inclined, what does external slave mean?

I am in LA County and I visit OC often
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Old 02-17-2017, 11:26 AM   #7
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Quote:
Originally Posted by 89Saharagreen View Post
Go to junk yard and get an ax15 and transfer case from a 97-2004 Dodge Dakota pickup 4x4 it is the AX-15 then just bolt in keep the transmission mount for your pegeuot because you will have to modify it to marry up with your belly pan.

Has to be 4x4 the AX-15 4x4 version has the right length output shaft and spline count. A 2wd one will be two long.

Chief
Thanks for your reply.

Do those Dakotas also come with the NP 231 transfer case?
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Old 02-17-2017, 01:06 PM   #8
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Thanks for your reply.

Do those Dakotas also come with the NP 231 transfer case?
Yes
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Old 02-17-2017, 01:26 PM   #9
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So maybe I am missing something why does the transfer case have to be NP 231?

If you are getting both transmission and transfer case from same donor vehicle they will obviously mate to each other....the only other issue would be the connection to the drive shaft. And you can easily change the yoke your self if you needed to.

Not trying to be a jerk here just trying to understand your question.

Besides you have the answer already.

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Old 02-17-2017, 01:44 PM   #10
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I'm not exactly sure. It may have something to do with the number of teeth on the splines of the NP 207 VS. the number of splines on the NP231. I assume the NP231 is a sturdier unit.

The NP231 should be what is attached to an AX15 when you buy it as a unit, but you never know what may have been done to your or the donor vehicle. Suggesting you get a NP231 may be considered redundant. I think the other posters are simply trying to emphasize being certain you get the correct transmission and transfer case.

As far as the internal and external slave cylinders, the current crop of internal slave cylinders are made offshore and very commonly fail. You have to remove the transmission to access the internal slave to replace it.
The external slave is mounted on the outside of the bellhousing and you can buy a pre-bled master/slave setup. It seems they are much less likely to fail, and if they do, they are much easier to change.

When mounting the master cylinder for the external slave setup on an early YJ, the technician has to open up the lower mounting hole on the master cylinder just a little bit. It's a easy operation.

My YJ has the Peugeot transmission and the NP207 and the internal slave. If I ever have problems with any one or the clutch, I will certainly replace the clutch, bellhousing, master/slave, transmission and transfer case with the 1994 and newer setup.

Hope all goes well for you. Don't be shy about asking questions. We all want to help.

Good Luck, L.M.
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Old 02-17-2017, 03:54 PM   #11
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Originally Posted by 89Saharagreen View Post
So maybe I am missing something why does the transfer case have to be NP 231?

If you are getting both transmission and transfer case from same donor vehicle they will obviously mate to each other....the only other issue would be the connection to the drive shaft. And you can easily change the yoke your self if you needed to.

Not trying to be a jerk here just trying to understand your question.

Besides you have the answer already.

Chief
Nah, don't worry about it. You're not being a jerk. I think I just misunderstood.
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Old 02-17-2017, 03:55 PM   #12
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Yes
Fantastic. Thank you very much, I'll start looking soon, hopefully
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Old 02-17-2017, 03:59 PM   #13
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Originally Posted by Luckymac View Post
As far as the internal and external slave cylinders, the current crop of internal slave cylinders are made offshore and very commonly fail. You have to remove the transmission to access the internal slave to replace it.
The external slave is mounted on the outside of the bellhousing and you can buy a pre-bled master/slave setup. It seems they are much less likely to fail, and if they do, they are much easier to change.
Ah, I see. I understand now

Thank you very much for your help. Hopefully the storm here in SoCal clears up quickly so I can go looking for an AX15 from junkyards.
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Old 02-18-2017, 03:22 PM   #14
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Ah, I see. I understand now

Thank you very much for your help. Hopefully the storm here in SoCal clears up quickly so I can go looking for an AX15 from junkyards.
Even when the storm clears up, the salvage yard will still be muddy. Bring your boots and a piece of cardboard to lay on if you go to Pick-&-Pay.
Unless the salvage yards in California are paved. I can't think of any around here that are paved.

Good Luck, L.M.
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Old 02-19-2017, 03:42 PM   #15
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Before you spend a wad of money, make sure your clutch lines are sound, and that your slave cylinder isn't shot. Although it would be nice to go with an AX15 tranny instead of the BA-10/5 and NP231 transfer case instead of the NP207, etc, if being able to just drive it without spending a bunch of loot is the issue, check the basics first. However, if your intention is to build/rebuild completely, go with the AX15 with external slave and the NP231.
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Old 02-20-2017, 11:22 PM   #16
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I was in the same boat recently with my 88' and I ended up rebuilding my BA10 myself. They are extremely easy to work on, the biggest challenge is finding reasonably priced parts for them.

If you decide to tackle this project yourself and you need any parts shoot me a message. I have an almost complete BA10 that I am parting out.

If you are paying shop labor to have your transmission rebuild I would agree with the others, it is probably not worth it.
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Old 02-20-2017, 11:35 PM   #17
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Nope the Pick a part places in Calif that I have seen aren't paved., but if you lie down on cardboard you would float away. It has rained over 100 inches so far this year in Northern Calif. and another storm front is coming in. This is how it used to rain in the 70's and 80's.Pic of my front driveway. We are NOT in a Drought here.
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Old 02-21-2017, 11:23 AM   #18
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I just swapped tranny and transfer case out of my 87 YJ, It had a BA-10/5 with a NP-231
T/C, No Kidding, both work great and are still together, and for sale, I changed to the AX/15 with a NP231 wide chain with SYE, Because the internal slave went south on the BA-10, I don't know how the np231 ended up with the BA-10 it was that way when I got it, I lucked out and bought an entire drive train, for 700 bucks All HD stuff, 3 tom woods drive shafts with the double carden u-joints, Jasper rearend, and more, out of another 87 YJ, It all swapped out pretty easy, had to put a 1.5 drop on the T/C cause of 4"rear driveshaft, but it all worked out,
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Old 02-21-2017, 01:36 PM   #19
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Maybe it was a late model 87'? My 88' had a BA10/NP231 from the factory
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Old 03-09-2017, 10:12 AM   #20
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I just pulled my BA/ 10 tranny from my 87 yj, it already has a NP231 transfercase on they both work just fine, I pulled them because it needed a new slave cylinder and throw out bearing (internal) I said to myself "Great time to change to an AX15" as I am building a more BAD ASS JEEP thus more tranny, My YJ came with the NP231 T/C some one before me did that, I found an AX15 with a beefed up NP231 T/C with wide chain set up and slip yoke eliminator, So that's why I'm selling my BA/10 with NP231 for $600.00, It just needs a new throw out bearing set up, slave and master and clutch, and it will be like new, Just drove from N.C. to Canada and back (1600) miles No Problems, Just I noticed the master was leaking and it needed to be changed, So I over built as usual!!! If Lots is Good, More's BETTER!!
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