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Unread 09-13-2013, 11:20 PM   #1
econstantin
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Can switch NP231 transfer case solo?

Hi, I've got a 94 YJ with an NP231 (that probably has about 233k miles on it). I bought a younger NP231 on craigslist that already has an SYE on it.

I've done a bit of reading on taking the NP231 off the AX-15 transmission, and it appears to be fairly straight forward... so I'm tempted to try it out myself.

Is this a job that can be done solo, or would I need a buddy to help out (i.e. holding it in place to align bolts, etc..)? I've got 6 jackstands and a jack, so I should be able to lift up the YJ and properly support the transmission?

Thanks
E

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Unread 09-13-2013, 11:29 PM   #2
bill8bud
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It can be done by yourself. I have done it before but it is really nice to have an extra set of hands.
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Unread 09-13-2013, 11:36 PM   #3
Anticanman
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I've done a few by myself. I also have an extra 231 that needs a SYE in my shop as well.

Lotsa options but a really long drive.

Do you have a driveshaft ready?
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Unread 09-13-2013, 11:40 PM   #4
Reno72
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I just pulled mine, did a SYE install and new driveshaft. I did it all myself (other than watching video's and reading threads) I'm not a pro when it comes to working on cars so it probably took me twice as long as most, but it was pretty straight forward.
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Unread 09-14-2013, 12:24 AM   #5
Joe Dillard
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Its been a long time since I pulled my 231 out, but IIRC when I shipped it to its new home, it weighed ~73# wet. In other words - yea, lots of folks can change them by themselves.
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Unread 09-14-2013, 12:59 AM   #6
econstantin
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Quote:
Originally Posted by Anticanman View Post
I've done a few by myself. I also have an extra 231 that needs a SYE in my shop as well.

Lotsa options but a really long drive.

Do you have a driveshaft ready?
Hey man, good to hear from you ... it's been a while! I've been going on some fun weekend mini-expeditions, you'd be proud

I don't have a driveshaft yet, I was going to put the NP231 w/SYE on first, remove the TC drop, then measure and order. I've got another car I can use in the meantime, so the YJ can sit in the driveway for a couple days.

I've been told it might need a new clutch, so I was also considering maybe just having shop do the clutch job, and then having them switch the NP231's while the tranny is out (wouldn't be much additional work for them to do that)... maybe save me some time & frustration. (though it would be cool/fun to do it myself)

Any recommendations for a drive-shaft? I've heard tom woods makes good ones.
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Unread 09-14-2013, 01:01 AM   #7
econstantin
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Quote:
Originally Posted by Reno72 View Post
I just pulled mine, did a SYE install and new driveshaft. I did it all myself (other than watching video's and reading threads) I'm not a pro when it comes to working on cars so it probably took me twice as long as most, but it was pretty straight forward.
Cool. Are there any particular threads or videos that were especially helpful? I don't need to install an SYE, just switch out NP231's.
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Unread 09-14-2013, 06:53 AM   #8
kloppk
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It's pretty straight forward. Solo job and have done it countless times.

Support the engine with a jack and a block of wood under the oil pan.
Remove the 2 tranny mount nuts from the bottom of the skid plate.
Remove the torque arm nut from the bottom of the skid plate.
Remove the 6 bolts securing the skid plate to the frame. I usually use a floor jack to lower it down.
Disconnect the driveshafts.
Disconnect the vacuum line plug.
Disconnect the speedo connector.
Disconnect the vent hose.
Disconnect the shift linkage.
Remove the 6 nuts from the tcase studs and slide the tcase off.
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Unread 09-14-2013, 09:55 AM   #9
Anticanman
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It would probably be easier to do the clutch and transfer case all in one whack. Once again, we can do it at my shop but I won't blame you for not wanting to drive down here. Again. Haha. Worst case scenario, a shop can just swap the transfer cases while they reinstall a new clutch. It isn't that big of a job, really.
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Unread 09-14-2013, 11:11 AM   #10
imstillatwork
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You may have done it countless times, but he has not. DON'T FORGET TO DRAIN THE TRANSMISSION


Quote:
Originally Posted by kloppk View Post
It's pretty straight forward. Solo job and have done it countless times.

Support the engine with a jack and a block of wood under the oil pan.
Remove the 2 tranny mount nuts from the bottom of the skid plate.
Remove the torque arm nut from the bottom of the skid plate.
Remove the 6 bolts securing the skid plate to the frame. I usually use a floor jack to lower it down.
Disconnect the driveshafts.
Disconnect the vacuum line plug.
Disconnect the speedo connector.
Disconnect the vent hose.
Disconnect the shift linkage.
Remove the 6 nuts from the tcase studs and slide the tcase off.
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Unread 09-14-2013, 11:17 AM   #11
Reno72
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Here is one
of course I used this as a guide as your Jeep may be a little differant. There are also some good write ups at Tom Woods site.
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Unread 09-14-2013, 11:45 PM   #12
linusb
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It's pretty easy, but it's a little precarious fitting it into place knowing that if it slips you could drop it right on your face.
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Unread 09-15-2013, 10:10 AM   #13
econstantin
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Quote:
Originally Posted by linusb
It's pretty easy, but it's a little precarious fitting it into place knowing that if it slips you could drop it right on your face.
Yeah, that's kind of what I was concerned about 😁
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Unread 09-15-2013, 10:15 AM   #14
econstantin
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Quote:
Originally Posted by Anticanman
It would probably be easier to do the clutch and transfer case all in one whack. Once again, we can do it at my shop but I won't blame you for not wanting to drive down here. Again. Haha. Worst case scenario, a shop can just swap the transfer cases while they reinstall a new clutch. It isn't that big of a job, really.
Yeah man, it'd be awesome to do it at your shop -- thanks! I'm currently driving through Utah back to Cali, so yours is really not all that far away, relatively .

I'll send you a message about finding a day that could work.
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Unread 09-15-2013, 10:21 AM   #15
Anticanman
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You'll need a driveshaft to drive it home unless you want to try front wheel drive back to The City.
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