Transfer Case Swap Info NP249->NP231 & NP242 - Page 119 - JeepForum.com
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Unread 10-17-2013, 04:00 PM   #1771
zarnold
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Quote:
Originally Posted by Muzramp View Post
Ah okay. Ill just get it shorten then.
I would install the 242, then test the driveshaft length. There have been several people who did not have to shorten. You might be one of the lucky ones.

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Unread 10-17-2013, 04:41 PM   #1772
Muzramp
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Originally Posted by zarnold View Post

I would install the 242, then test the driveshaft length. There have been several people who did not have to shorten. You might be one of the lucky ones.
Yeah I have the upcountry suspension I dont know if thats a factor. But yeah thats my plan. Install transfer case first day im off work. Then if I had to shorten it it gives me an extra day were I don't need my jeep.
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Unread 10-17-2013, 07:28 PM   #1773
Platinum5nine
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When i did my 242 swap on my 5.9 i did not have to do anything with the rear shaft. I have about 1" before it bottoms out. Keep in mind im at stock ride height and i never wheel it. Daily drving the shaft only moves about 1/4" in either direction.
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Unread 10-20-2013, 09:17 PM   #1774
PopperM5
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I'm getting ready to swap my 249 TC from my 94 5.2 with a 242 TC from a 98 I6 in a couple of weeks. I have 3.5" of lift and was wanting to confirm if I was going to have to do anything to the rear DS. If I have read everything right, I think that I have to use the front half of my 249 with the rear half of the 242. Just wanting to know if I was missing anything. Thanks guys.
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Unread 10-21-2013, 12:05 AM   #1775
Myusername1674
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Originally Posted by PopperM5 View Post
I'm getting ready to swap my 249 TC from my 94 5.2 with a 242 TC from a 98 I6 in a couple of weeks. I have 3.5" of lift and was wanting to confirm if I was going to have to do anything to the rear DS. If I have read everything right, I think that I have to use the front half of my 249 with the rear half of the 242. Just wanting to know if I was missing anything. Thanks guys.
Its hard to say for sure until you actually do it. Your 242 should have the external slip yoke, which is longer, but the 3.5 inch lift should make up for that.

I have a 2" lift and swapped my case to one with an external slip, i only needed around 1/2" taken off my ds to make it work. (i had them shorten it 2" but could have gotten away with 1/2-1")

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Unread 10-21-2013, 08:44 AM   #1776
PopperM5
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Myusername1674,
Thanks, hopefully this will go pretty smooth and will not have any issues.
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Unread 10-22-2013, 07:58 PM   #1777
Muzramp
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Well my swap went great thanks to you guys. 249 97 to 242 97. Everyrhing bolting up perfect. Now just gotta shorten driveshaft about an inch.
Didn't think my other tc was so bad. Drained the fluid, and there was rubber shavings in the the fluid.
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Unread 10-23-2013, 09:23 PM   #1778
Platinum5nine
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So far i have 2 swaps done and here are my results

1998 ZJ 5.9 shock height 242 out of a 96 ZJ 4.0 direct swap no need to shorten the driveshaft. It NEVER gets wheeled, street Jeep only

1997 ZJ 5.2 lifted 4.5" 242 out of a 97 ZJ 4.0 direct swap no need to shorted the driveshaft. I have more than enough room to flex with out bottoming anything out.

I think you guys shortening the shafts feel the yoke slips more than it actually does. The driveshaft moves very very little in either direction unless you compress the suspension to the bump stops on both sides in the rear at the same time which is not going to happen unless you jump it. Im going to get pictures of both my ZJ's tomorrow showing the yoke at the transfer case. Would be cool for you guys to do the same just to see where everyone is at.
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Unread 10-24-2013, 10:00 PM   #1779
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Quote:
Originally Posted by Platinum5nine View Post

I think you guys shortening the shafts feel the yoke slips more than it actually does. The driveshaft moves very very little in either direction unless you compress the suspension to the bump stops on both sides in the rear at the same time which is not going to happen unless you jump it. Im going to get pictures of both my ZJ's tomorrow showing the yoke at the transfer case. Would be cool for you guys to do the same just to see where everyone is at.
Mine had to be shortened 'cause with it 100% bottomed out it was still too long to even fit under mine. I had it brought down two inches, so I have about 1 1/2" travel both ways. You can't really see it in the picture I just took 'cause of the boot though. haha

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Unread 10-24-2013, 10:13 PM   #1780
Muzramp
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Originally Posted by Myusername1674 View Post

Mine had to be shortened 'cause with it 100% bottomed out it was still too long to even fit under mine. I had it brought down two inches, so I have about 1 1/2" travel both ways. You can't really see it in the picture I just took 'cause of the boot though. haha
I was thinking of shortening mine 1.5inch. The way it is now. I cant get it to even bolt on. It needs to be 1/4 in short just to get it to slide into the ujoint. And thats with it 100 percent on the yoke. So Im thinking 1.5inch short will be a good measure. I dont offroad or anything
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Unread 10-24-2013, 10:18 PM   #1781
Platinum5nine
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I really dont understand why some of us have no reason to shorten the driveshafts yet others do? Just doesnt make sense.
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Unread 10-24-2013, 10:36 PM   #1782
Muzramp
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I really dont understand why some of us have no reason to shorten the driveshafts yet others do? Just doesnt make sense.

Yeah it is definitely odd. 5.9s dont have tk shorten. But 5.2 its a 50/50 chance.
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Unread 10-24-2013, 10:39 PM   #1783
Platinum5nine
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I didnt on my 5.2 but im lifted 4.5" so im sure thats a big part of it. I just went to run outside to get pictures and of course my camera is dead. Why wouldnt it be lol
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Unread 10-25-2013, 05:14 AM   #1784
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I really dont understand why some of us have no reason to shorten the driveshafts yet others do? Just doesnt make sense.
Becuase early/mid 90s American cars...
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Unread 10-25-2013, 08:46 AM   #1785
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Originally Posted by Muzramp View Post
I was thinking of shortening mine 1.5inch. The way it is now. I cant get it to even bolt on. It needs to be 1/4 in short just to get it to slide into the ujoint. And thats with it 100 percent on the yoke. So Im thinking 1.5inch short will be a good measure. I dont offroad or anything
That's exactly how mine was, so yeah you should be fine with 1.5 inches.

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Originally Posted by Platinum5nine View Post
I really dont understand why some of us have no reason to shorten the driveshafts yet others do? Just doesnt make sense.
Well it's because of all of the different variables.

93-95 had longer transmissions and all had the dana 35 rear.

96-98 5.2's had shorter transmissions, but longer rear axle pinion; the dana 44a.

96-98 4.0 had different transmission (I think shorter than 93-95) and had the dana 35 rear. So these had longer driveshaft then the 96-98 5.2s.

Then you've got the 98 5.9, which I think has a different transmssion even then the 96-98 5.2.

On top of that, depending what case you swap in will make a difference, after 96 (I believe) Jeep transfer cases starting coming with an external slip yoke, which was 1.5 inches longer than their internal slip yoke counterparts.

Then you have the fact that most guys on here have lifts on their jeeps, anywhere from 1" to 5", and in some cases even higher. So basically, there are just too many variables to be able to determine unless you just do the swap and find out for yourself.
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