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Old 02-21-2011, 12:31 PM   #1
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Jeep Yj Transfer case to replace a Jeep Tj case

this might be a really stupid question but is there any chance that a Jeep Yj's transfer case is the same a Tj's transfer case. in that i could replace the Tj's transfer case with the Yj's

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Old 02-21-2011, 12:54 PM   #2
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You might need an adapter depending on what transmission you have. We need to know the year, engine and transmission your TJ has.

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Old 02-21-2011, 04:07 PM   #3
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my Jeep is a 1998, 4 cylnider engine, and im not sure what transmission i have sorry im only 16
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Old 02-21-2011, 04:11 PM   #4
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Do this. Crawl under your jeep and look on the back of the T-case. There should be a circular tag that says the model. It should say NP231 if its not a rubicon. In that case then look at the yjs t-case and make sure its a np231. You may have to change out the input gear.
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Old 02-21-2011, 05:25 PM   #5
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There is a difference internally in that the YJ t/c does not have a true neutral that may only make a difference if you tow your jeep. This is what was explained to me from someone who was very knowledgeable when I asked roughly the same question. Where as the TJ t/c does have. There may be other differences but I only know of the one.

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Old 02-21-2011, 08:01 PM   #6
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Trust me my YJ's t-case has a true neutral. It sure as hell aint going no where when I have it in neutral and hit the gas. To me atleast it doesnt get as true as that.
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Old 02-21-2011, 08:14 PM   #7
Knows a couple things...

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You just have to make sure the YJ transfer case came out of a YJ that has the same 2.5L engine and transmission yours has. If yours has the 5-speed, the t-case has to have come out of a YJ that had a 5-speed.

The reason for that is so the input and output shaft spline counts will match and their lengths will be the same.

That said, the YJ 231 is not as good as the TJ 231 in a few ways like the fact it will leak with the rear driveshaft removed. I personally would hold out for a transfer case out of a TJ.

And I'm not so sure the YJ's t-case has a true neutral for the front driveshaft when you're in 2wd. That is the reason for, I believe, the YJ's need for its passenger-side vacuum operated axle unlock mechanism so it will steer ok in 2wd and why the TJ doesn't need the YJ's front axle disconnect.
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Old 02-22-2011, 03:53 PM   #8
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my old yj is an automatic and it is a 4-cylinder just like the Tj. so do you guys think i should take the Yj's t-case and replace my Tj's t-case or just buy a new Tj t-case, my dad said it'll probably cost around 1,000 for one. but then again he'll probably understand more of what you guys are telling me than i do.
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Old 02-22-2011, 03:59 PM   #9
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I would maybe go to a salvage yard and source a used TJ case from another TJ like yours. You would be able to get one for under $1,000.
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Old 02-22-2011, 09:29 PM   #10
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not a jeep wizard however the tj will lock up because the front axle is running at road speed and with a central axle disconnect as per the yj the transfer case would have to bring the front driveline up to speed before lockup so that front drive would be on a syncro clutch
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Old 03-28-2011, 09:24 PM   #11
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I'm not saying it will or will not work but I do know there are some differences. All the TJ's have a different tail piece with a longer output shaft. I feel confident you would need a new drive shaft. They also use electronic speedo and unless the YJ Case is mid 93' or newer it will have a cable. You may be able to use the speedo gear out of your TJ Case, I don't know. The linkage is pointing down on you TJ also and the YJ is pointing up.

I don't know if you've already found a Case but I have a TJ Case freshly rebuilt and ready to go for about $300 if your interested. I'm not sure where your located by I am in NC, 27311. You can PM me if you're interested in it. Good Luck!!

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