NP249 T-case dying & want to swap to a NP242 or NP231 - JeepForum.com
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Unread 12-31-2008, 05:59 PM   #1
IMin4Low
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NP249 T-case dying & want to swap to a NP242 or NP231

I have a '98 ZJ 5.9L & my NP249's had it. I've read the pros & cons of the 231 & 242 and have decided that although I off road quite a bit, I'd rather have the NP242 because I DD this a ton.

I take that the NP242 will just bolt in? ( I know, besides modifying the linkage & shift indicator) Which year/make donor would it be best to get it from?

Thanks for any & all help

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Unread 12-31-2008, 06:09 PM   #2
ratmonkey
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you'll need to swap inputs as the v8 transmissions have longer input shafts on the tcases.

get it from a 97+ zj or xj.
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Unread 12-31-2008, 08:04 PM   #3
IMin4Low
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I thought I might have to swap inputs if the 242 came from a 4.0L, but wasn't there a NP242 option in the ZJ?
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Unread 12-31-2008, 08:08 PM   #4
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Quote:
Originally Posted by IMin4Low View Post
I thought I might have to swap inputs if the 242 came from a 4.0L, but wasn't there a NP242 option in the ZJ?
They did make them for ZJ's but I think only for the 4.0. I had a 231 in my old 93 4.0 ZJ but it crapped out.
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Unread 12-31-2008, 08:14 PM   #5
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You may have to swap input shafts, I didn't, but I needed a shorter rear DS from a ZJ that came with a 242. Try to get the case from a '97 or '98 ZJ.
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Unread 01-01-2009, 02:40 AM   #6
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Quote:
Originally Posted by ratmonkey View Post
you'll need to swap inputs as the v8 transmissions have longer input shafts on the tcases.

get it from a 97+ zj or xj.
Not true.

OP has a later ZJ. If you get the 242 from a later ZJ you will not have to swap input shafts. With the later ZJ, the 242s do not have the cone looking housing for the output shaft, instead they use a boot so I would also ask for the rear driveshaft from the vehicle the TC came out of!
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Unread 01-01-2009, 05:58 PM   #7
IMin4Low
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Now you can understand my confussion. Thank you. I will look for a late model ZJ with the 242 then & not mess with splitting the case.

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Unread 01-01-2009, 06:35 PM   #8
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Wow...I could smell the misinformation and hearsay from a mile away - stinky

96 and up is what you're looking for (most likely). However, you really won't know what input you have until you have the old case on the ground. .840" exposed input shaft should be what you see on the 97.

Also - some 96-98s had the exposed tailshaft (booted driveshaft), some had the enclosed tailshaft (cone on the rear of the case). You need to make sure you get the same for yours in order to have the best chance of success.

In short: for a 96+, you need to look for a 96+ donor. Input shaft length should be .840", and match the output type (enclosed or exposed).

You can do an earlier case and swap inputs, but it's not a fun job...not a hard job, just not too much fun.
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Unread 01-01-2009, 06:42 PM   #9
IMin4Low
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Thank you Thank you THANK YOU...... that's the 1st clear explaination I've seen. I'll drop it, measure & look for a match.

Thanks again FPKites, from the Western Slope!

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Unread 01-01-2009, 06:54 PM   #10
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Glad I could help with the info.

Wish I could help with the install, but GJ is a bit of a hike just for beer and pizza
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Unread 01-01-2009, 08:05 PM   #11
IMin4Low
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Not even for Canadian beer? Have got some good single malt scotch as well????? Am afraid we wouldn't get much done!!

I found a nice like for this swap as well:

http://jeephorizons.com/tech/tcase.html

So if I/anyone else can't find the "perfect" donor, here's how it's done.
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Unread 01-01-2009, 08:07 PM   #12
FPKites
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Canadian beer would be even more of a deal breaker
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Unread 01-01-2009, 08:12 PM   #13
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Yeah, but there ain't no 3.2 north of the border...

Most American beers need 5 to make up the alcohol content of 3 Canadian beers.

(unless of course he bought it here, in which case it isn't truly Canadian beer)
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Unread 01-01-2009, 08:24 PM   #14
IMin4Low
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Nope, is true blue Labatts bought proudly in Sault Ste Marie, Ontario just last week! M-M Good
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Unread 01-01-2009, 08:33 PM   #15
IMin4Low
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FYI......

http://www.nagca.com/grandtech/Jeep%...fer%20Case.pdf

This is a nice link showing lubes & capacities for axles & T-case. It also lists which vehicles came with what stock:
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