Transfer Case Swap Info NP249->NP231 & NP242 - Page 113 - JeepForum.com
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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Transfer Case Swap Info NP249->NP231 & NP242

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Unread 09-16-2013, 10:03 PM   #1681
David97
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Quote:
Originally Posted by tweb View Post
Ok my head is spinning, I have a 95 gc 4.0 with a 249tc production date of 10/27/93. So my question is what year 231 or 242 should I be looking for to do a swap?
93-95 I6 ZJ's with the 42RE: .840" 23 spline input (with collar)
All 96-98 ZJ's: .840" 23 spline input
All 96-01 XJ's: .840" 23 spline input

From the beginning of the thread.

The 93-95 V8s are the trickier ones, since we have the longer input shaft. Not too sure what the collar is, lol but looks to me there's some straight bolt in options.

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Unread 09-16-2013, 10:21 PM   #1682
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Quote:
Originally Posted by David97 View Post
93-95 I6 ZJ's with the 42RE: .840" 23 spline input (with collar)

Not too sure what the collar is, lol
Heres the collar I posted pics and info about it about 11 pages back on page 102, post #1520.

Had to tear the case apart to remove the collar from the input on a 93-95 231 to install in my 98. This is only the tcases that were on the early 93-95 42re trans equipped ZJs.

The collar is the silverish ring behind the splines on the input in the below pic.



And a pic of the collar removed.

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Unread 09-16-2013, 10:27 PM   #1683
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Ahhh gotcha. Learn something new everyday. Thanks, lol
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Unread 09-16-2013, 10:41 PM   #1684
98GCLimited
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Quote:
Originally Posted by tweb View Post
Ok my head is spinning, I have a 95 gc 4.0 with a 249tc production date of 10/27/93. So my question is what year 231 or 242 should I be looking for to do a swap?
So according to the thread and some knowledge I have gained along the way with my swap if you have a 42re trans in your ZJ which you should with the 4.0 then you can swap in any 93-95 transfer case that came from a ZJ with the 42re trans and any 96-98 transfer case from a ZJ or 96-01 XJ transfer case will also have the .840" input.

Since you have a 95 you probably have the older style transmission output that accepts the collars on the early 93-95 42re transmission transfercases and will also work with any 96-98 42re trans since they are all .840" input lengths and 23 spline inputs.

My early 93-95 231 had the same connector as my 98 for the transfer case shift position sensor so that plugged up and I just swapped the speedometer sensor and gear over from my 249 to the 231 since the plugs were different. Both cases were external slip yoke and .840" input and other than the collar issue for me the stock driveshafts and wiring harness plugs all worked.

Here is the pics of the different 42re transmission output shafts the early 93-95 version that used the collar in the transfer case inputs and the newer version that cannot use with the collar (collar must be removed or input swapped).

This picture is of the early 42re trans with the output setup to use the collar. Which I assume you have but being a 95 might or might not have switched over to the newer one at that point when yours was built.



And the 96-98 style 42re transmission outputs that dont work with the collar in the transfer case input. (Need to tear down the case and remove collar from input if it has the collar in the input.)



So it shouldnt be hard to find a case to swap into your ZJ as long as you have a 42re trans you most likely can use any 93-95 ZJ case thats from a 42re trans equipped ZJ or any 96-98 ZJ/96-01 XJ transfer case and the inputs should work for you.

Hopefully this helps you and isnt confusing at all. Otherwise ask more questions and someone will help you get it figured out here.

edit: Just saw that your case was built in 93 so it should have the collar in the input and any 242 or 231 case should work without having to split apart the case from a 93-95 ZJ with 42re transmission or any 96-98 ZJ transfer case since they are all 23 spline .840" input length. Also any 96-01 XJ transfer case should have the proper transfercase input for your swap, not sure about electrical connectors though you would have to ask someone else about that.
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Unread 09-17-2013, 04:07 AM   #1685
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Thanks for all the replies, I got it and will be going to the bone yard this weekend!!! tc`s at the local u-pull it are only 50$ around here. As long as I can find one.
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Unread 09-17-2013, 08:01 AM   #1686
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Thanks for all the replies, I got it and will be going to the bone yard this weekend!!! tc`s at the local u-pull it are only 50$ around here. As long as I can find one.
I'd bring extra money, it said $50 online but when i went and bought mine they charged me $70. (still a good deal!)

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Unread 09-19-2013, 10:54 PM   #1687
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I see a lot of talk here about rear drive shaft length and having to shorten it, i can say first had that you dont have to. I pulled the 249 out of my 98 5.9 put a 242 in out of a 97 ZJ with a 4.0 Jeep is stock height no lift, stock rear shaft stock shifter and shift gate and stock linkage. I did of course use the tab on the 242 which is quite a bit shorter than the tab on a 249. Direct swap no driveshaft length problems has about 25k miles on it and 3 years since the swap.
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Unread 09-20-2013, 12:01 PM   #1688
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Quote:
Originally Posted by Platinum5nine
I see a lot of talk here about rear drive shaft length and having to shorten it, i can say first had that you dont have to. I pulled the 249 out of my 98 5.9 put a 242 in out of a 97 ZJ with a 4.0 Jeep is stock height no lift, stock rear shaft stock shifter and shift gate and stock linkage. I did of course use the tab on the 242 which is quite a bit shorter than the tab on a 249. Direct swap no driveshaft length problems has about 25k miles on it and 3 years since the swap.
I don't know how that's possible. My niner had less than an inch of shaft exposed. It would have hit for sure. That's with a early 97 242. Same as yours. I had mine shortened an inch. Works perfect.
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Unread 09-20-2013, 01:28 PM   #1689
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Originally Posted by csouers View Post

I don't know how that's possible. My niner had less than an inch of shaft exposed. It would have hit for sure. That's with a early 97 242. Same as yours. I had mine shortened an inch. Works perfect.
How much lift are you running?
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Unread 09-21-2013, 09:09 PM   #1690
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Yea i have about 1" before it would bottom out. Im not worried about it, Jeep never sees any kind of bad weather let alone mud. All the mods are performance mods is a fast street pnly Jeep. My 97 ZJ is the off road Jeep. Im going to do a 242 on that also but thats lifted 4.5" so i doubt ill have any problems with the driveshaft length.

BTW in the event you are worried about the shaft being to long simply cut 1" off the yoke on the driveshaft. Problem solved.
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Unread 09-21-2013, 09:39 PM   #1691
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Originally Posted by hondakilla98 View Post
How much lift are you running?
0". Hit a bump or speed bump at any decent speed and when the rear suspension compresses, boom. There goes your $400 (in my case rebuilt and all) tcase.
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Unread 09-22-2013, 12:22 AM   #1692
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Originally Posted by csouers View Post

0". Hit a bump or speed bump at any decent speed and when the rear suspension compresses, boom. There goes your $400 (in my case rebuilt and all) tcase.
I was under the impression that you needed at least 4.5+" of lift to not cut the shaft. For later v8 anyway.
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Unread 09-22-2013, 08:21 PM   #1693
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I didn't shorten the shaft in my 5.9, just trimmed the t-case splines about 3/4". It's got no more than an inch of travel before bottoming out, but it never has (even while wheeling)
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Unread 09-23-2013, 04:04 AM   #1694
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Originally Posted by hondakilla98 View Post
I was under the impression that you needed at least 4.5+" of lift to not cut the shaft. For later v8 anyway.
With stock control arms, the more lift you have, the more likely you're going to have to shorten the driveshaft.
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Unread 09-23-2013, 07:34 PM   #1695
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Np231 help

I removed my busted 231 and am replacing it with a used one. Got it in, and realized I am missing three bolts. I cannot find ANYWHERE online what these bolts are and have wasted my whole free evening looking for the ones I lost and running up to auto parts places, failing. Do you know what size the mounting bolts are by chance??? Any help would be much appreciated guys!
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