NP249 to NP231 swap - North American Grand Cherokee Association
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Old 02-12-2007, 10:21 PM   #1
jiveturkey692000
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Default NP249 to NP231 swap

I have a 95 Grand with the 5.2. It has the 249 and I believe the viscous coupler is shot, I have had it a whole 3 days :roll: . Anyway I have a 90 XJ with a 231. What do i need to do to swap it. Will the driveshafts from the grand work? I know I will have to change the input shaft. What has to be done to the linkage or which linkage do I need to use? I have learned alot on this site the last couple days. [smilie=bowdown.gif]

I may go with the 242 if I can find one because this is my wifes daily driver for now and the fulltime option is nice for her.

Any help is appreciated :mrgreen:
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Old 02-12-2007, 11:34 PM   #2
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Well I do hate to say this, but it is just so much easier than explaining everything. Use a search.
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Old 02-12-2007, 11:48 PM   #3
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Ok so I did a little search for ya since this is what I went by when I swapped from a 249 to a 231. here ya go http://www.kevinsoffroad.com/techart...1caseswap.html
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Old 02-13-2007, 06:19 AM   #4
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Quote:
Originally Posted by 1995zj
Ok so I did a little search for ya since this is what I went by when I swapped from a 249 to a 231. here ya go http://www.kevinsoffroad.com/techart...1caseswap.html
Thanks, I did a search, but I didn't think to search everything, I just searched this site :roll: . The input gear looks like it might be a problem since my zj is a 95 [smilie=bal_ask.gif]

"Kevins Offroad,
Input Gear
Needs to be a 23-spline, but the length is not known until the case is actually removed from the Jeep. You can make an educated guess as to what it will be, but there is no for sure way of knowing what it is. Usually you can swap the input shaft from the 249 into a 231, but there was a change in the gear cut right around 94 or 95. I got my case from a 90 YJ and needed to swap input shafts. The one from my 249 (1995) was the wrong gear pitch, which would've seriously screwed up the t-case. I had to purchase a new input gear to match the t-case and tranny. They are NOT cheap!! I paid more for that gear than I did for the whole case. The original 231 I put in has since been retired due to the front driveshaft coming apart and knocking a hole in the case, and the 231 I replaced it with already had the correct length shaft on it. So . . . I have two spare input gears for jeep t-cases. Both are the longest there is, one old gear cut, one new. If you do the swap and run into the same problem I did, and need a long input gear, let me know!! "

I would imagine this is a problem, does the gear change affect swapping the 242 to?
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Old 02-13-2007, 07:20 AM   #5
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YES! Another 249 to 231 thread! Score!
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Old 02-13-2007, 09:14 AM   #6
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Mine is a 95 as well...I did have to swap the input gear but as long as you have a Factory Service Manual (FSM) and some decent mechanical skills you shouldn't have any problem with doing it. Plus it's worth it to clean the entire inside of the T-Case.
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Old 02-13-2007, 11:20 AM   #7
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Like you said. Yes!!! another TC Swap thread!

same process.... do it.

http://www.nagca.com/forum/viewtopic.php?t=26048
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Old 02-13-2007, 07:07 PM   #8
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When doing a 249 to 231 or 242 tc swap in a 97GC, what can be done to the VIC so that it reads correctly??
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Old 02-13-2007, 08:10 PM   #9
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pull a VIC from a ZJ with the coordinating TC...
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Old 02-13-2007, 10:47 PM   #10
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how about this? http://cgi.ebay.com/ebaymotors/Jeep-...QQcmdZViewItem
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