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Tcase swap

Old 02-11-2017, 06:40 PM
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Default Tcase swap

OK so I have a 97 zj i6 with a 242 currently in it and I was considering swapping to a 231 was wondering aside from the tcase what else is needed, and will it bolt right up.
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Old 02-11-2017, 09:32 PM
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What's your reasoning behind doing this?
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Old 02-11-2017, 09:42 PM
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Tired of anytime I try and shift from 2wd to 4hi it gets stuck in 4 part time, and heard the 231 was a better tcase.
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Old 02-11-2017, 09:50 PM
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It's better because it ONLY HAS PART TIME! You probably just need shift fork pads in yours.
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Old 02-12-2017, 05:55 AM
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Originally Posted by dave1123 View Post
It's better because it ONLY HAS PART TIME! You probably just need shift fork pads in yours.
I thought the 231 only had full time? Part time means use only part time, it is a full lock, The 231 has that visuss coupling that engages part time 4x4 when one driveshaft spins faster than the other. It creates heat and causes them to lock but its still not a lock since it then goes into a planetary open gear set, that would only have one axle still or not? Then if you did this swap, how would that run with the computer and dash lights etc? I read upon this before , I'm still in the middle of doing some stuff like this, I just have very little time and long gaps between time and forget. Can someone make a STICKY for transmissions and transfers and all that goes with them? For ZJ of course. As I understand even some Dodge trannies are the same or similar.
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Old 02-12-2017, 05:59 AM
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I like the 242 better, but a good 231 is so convenient. I guess you don't really need a high range full lock. It can even be dangerous in some instances on snow or ice.
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Old 02-12-2017, 08:20 AM
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You better do some research before you start picking t/cases.

NP249, constant 4wd, high and low range only. This is the one with the viscous clutch.
NP 231, 2wd, 4wd part time and 4wd low range part time.
NP242, 2wd, 4wd part time, 4wd full time, 4wd low range part time.

Part time locks both axles together with no slippage. The 242 full time uses a differential to allow changes in axle speed between the two. The only problem with the 242 in full time is if one wheel is on ice, it will spin and you'll go nowhere.

Check out http://jeepforum.com/forum/f13/trans...-np242-685644/
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Old 02-12-2017, 11:14 AM
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Yeah I have to research all this stuff again, I'm dreading it. Charter internet is horrible, it took around 10 minutes to just post this reply. So you can imagine the frustration with pages not loading, links not working, etc. Let alone the long searching through threads for info.
I confused the 231 with the 249 earlier, I cant recall ever seeing a 231, I think they are in older jeeps. Like I said it sure would be nice to have a STICKY with these histories of trannies and transfers, what bolts up, advantages, what works with OEM computers, what can be interchanged. Its so many small differences and what not.
But to the guy wanting to use a 231 in place of a 242, I really wouldn't do it. I have a V8 jeep with the 249, I like it I guess, although I like the 242 in the I6 jeep better. Mine is stuck in full time right now, well it wont go past part time, so I leave it in full time. Really full time isn't all that bad to run in. All the parts that engage turn anyway so the mileage isn't so noticeable and its not a full lock.
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Old 02-12-2017, 07:49 PM
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I can't agree with you more! Time Warner, now Charter Spectrum, has always been bad news with high prices and bad service. I originally had TW cable TV and went to Dish 15 years ago and never looked back. I went from Verizon dial-up to Verizon DSL and now Verizon Fios for internet.

I just had a long text about the 231 deleted by my cat stepping on my keyboard! Not an internet connection problem! Basically the 231 is usually only found in XJs, unless someone has swapped it into something else. Maybe TJs, IDK. The computer doesn't get involved with t/cases except to say "part time" on the VIC or dash light.
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Old 07-12-2017, 10:46 PM
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I had no service issues with Time Warner/Spectrum here in Tx(Austin area)
great internet speeds and decent channel lineup
my complaint was the bundled service packages that forced me to have telephone service to get the Best Price for internet and cable service UGH
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Old 07-13-2017, 04:14 AM
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My Dad worked for Bell Labs most of his life and he told me to always keep a hardwired phone in the house because when the power goes off, the phone still works. That's all well and good but Verizon just informed me that copper-wire service would be ending soon. I now have Verizon Fios for internet and phone, but kept Dish for my TV. The Verizon installer told me confidentially not to get Fios TV yet because they were still having problems with it. When I had Verizon DSL, it took 45 minutes to download a 93 mb file! When I tried to send the same file to my friend, Yahoo said it was too big!
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