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Old 04-30-2013, 08:53 PM   #1
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99 XJ NP242 into 04 TJ

Situation at hand is that recently my NP231 has been giving me issues and just today my brother rolled his XJ. Since he is parting it out I've been thinking about swapping t-cases.

Mine: 04 TJ auto 6cyl np231
Brother: 99 XJ auto 6cyl NP242

I've been doing some research and it looks like swapping out the the 242 and replacing it with a 231 is big for XJ's and it's easy. Which makes me assume it should be the same the other way around but I can't seem to find any write up or good info on swapping a 242 into a TJ.

Any help would be great!

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Old 01-26-2014, 01:06 PM   #2
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Did you ever get anywhere with trying to figure this out?

I was looking through some magazines and read about the full time part time 4WD the 242 offered and was kind of interested in seeing if it could be done. It could be really useful in a DD and still maintain the fully locked 4Low gears for going and getting dirty. Interesting to say the least.

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Old 01-26-2014, 05:49 PM   #3
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Not sure what goes into it as the PO fitted it, but I've got a 242 in my '97 TJ 4.0. Works brilliantly. It's got a transfer case drop on it but I don't know if that was fitted to accommodate the lift or if it was necessary for the switch.
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Old 01-26-2014, 07:04 PM   #4
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Quote:
Originally Posted by MaximumJed View Post
Not sure what goes into it as the PO fitted it, but I've got a 242 in my '97 TJ 4.0. Works brilliantly. It's got a transfer case drop on it but I don't know if that was fitted to accommodate the lift or if it was necessary for the switch.
Ive been looking into the tech specs and parts diagrams and it honestly looks pretty much the same as the NP231 which is what I have now. The big difference is there is a mechanism similar to a limited slip which is open for 4H Full time, and closed for 4H Part time. Whats cool is first and second gen Hummers came with the NP242 so its available in a 32 spline model with a 4:1 low range. There are even models that came stock attached to an AX15 transmission, like I have. I even have a buddy who could do a hack 'n tap SYE for one

I'm not sure why we don't see it used more often at least on paper the thing looks pretty awesome. I am officially looking for one.
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