Transfer Case Swap Info NP249->NP231 & NP242 - Page 100 - JeepForum.com
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Unread 01-26-2013, 02:24 PM   #1486
ratmonkey
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Quote:
Originally Posted by 98GCLimited View Post
Thanks man I just went for it and bought it.

Worst case scenario I need to swap inputs, planetarys, and front case half and adjust rear driveshaft length but thinking it could possibly be a direct bolt in which would be sweet.
you can't swap a front case half from a 249 to a 231, the cases are different.

the early model has a shallow collar or ring seated into the female end of the input shaft. you need to knock that out to use that case with a later model transmission.

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Unread 01-26-2013, 02:46 PM   #1487
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Quote:
Originally Posted by ratmonkey View Post
you can't swap a front case half from a 249 to a 231, the cases are different.

the early model has a shallow collar or ring seated into the female end of the input shaft. you need to knock that out to use that case with a later model transmission.
Ok, thanks for letting me know that, I didnt know.

I found that thing about the collar in this thread, but I just cant quite picture how its in there and how to get it out without seeing it myself or a picture of it. (I ordered it off the internet, so I dont physically have the case yet but I bought it already.)

Do I need to pull the case apart and take the input out to get the collar out or can it be pulled out of the input from the outside somehow and I wouldnt need to open the case?

Thanks for the help so far guys
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Unread 01-26-2013, 10:08 PM   #1488
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May be dumb thing to ask but can the output's be switched from External to internal? Like take the output housing off a 249 and put it on a 242?
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Unread 01-27-2013, 12:37 AM   #1489
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May be dumb thing to ask but can the output's be switched from External to internal? Like take the output housing off a 249 and put it on a 242?
That's a good question.

I actually had to put my swap that I had planned for today because I assumed my '96 MY (late '95 build date) ZJ had the ESY like the donor '97 242 t-case had. When I went under to pull the rear driveshaft I noticed my 249 had the ISY.

Can I swap outputs or am I stuck snagging the driveshaft from the donor Jeep or having my factory one shortened?

EDIT: I guess I could swap case halves correct?

DOUBLE EDIT: I eventually plan on a 3-3.5" lift, so is there any advantage to swapping driveshafts, swapping case halves or have the driveshaft shortened?
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Unread 01-27-2013, 11:04 AM   #1490
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No, you can't swap outputs.
Have your shaft shortened.
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Unread 01-27-2013, 12:01 PM   #1491
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I'm hoping I can find a decent donor. The wrecking yard I got the case from has several 96-98 ZJs with the 242 in it and if I go on a Wednesday a driveshaft would only cost me $14.

Would any 96-98 242 ESY rear drive shaft work regardless of engine/trans or am I going to need to find one out of an eight cylinder?
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Unread 01-27-2013, 02:22 PM   #1492
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I'm hoping I can find a decent donor. The wrecking yard I got the case from has several 96-98 ZJs with the 242 in it and if I go on a Wednesday a driveshaft would only cost me $14.

Would any 96-98 242 ESY rear drive shaft work regardless of engine/trans or am I going to need to find one out of an eight cylinder?
8cyl never came with the 242
you're probably not going to find a drive shaft to bolt right in. the drive train lengths and pinion positions are different between the i6 and v8 models.
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Unread 01-27-2013, 09:11 PM   #1493
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Ok, probably gonna get flamed here but I was at pull a part saturday and had 242's laying on the ground all around me. Problem is, not 100% on donor jeeps. I have figured out that my niner has the .840 23 spline input shaft, but what year XJ's and ZJ's are a direct fit. I think most of the 242's are from XJ's. I may have missed it and honestly have not read all 100 pages but is there a table of "this is your year, this is what fits" floating around?
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Unread 01-27-2013, 09:34 PM   #1494
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No, you can't swap outputs.
Have your shaft shortened.
If i had the money i would but all the local shops want $200 to do it. And every junk yard around here lifts from the side making driveshafts unusable and the 1 place that lifts from the front don't have what i need and the one place stateboro jeep junkyard wants about $150 for a Driveshaft.... Its driving me nuts....
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Unread 01-27-2013, 09:35 PM   #1495
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Quote:
Originally Posted by x10radsponge View Post
Ok, probably gonna get flamed here but I was at pull a part saturday and had 242's laying on the ground all around me. Problem is, not 100% on donor jeeps. I have figured out that my niner has the .840 23 spline input shaft, but what year XJ's and ZJ's are a direct fit. I think most of the 242's are from XJ's. I may have missed it and honestly have not read all 100 pages but is there a table of "this is your year, this is what fits" floating around?
You could try this link it might help.

http://www.drivetrain.com/parts_cata...arts/jeep.html
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Unread 01-27-2013, 10:07 PM   #1496
ratmonkey
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Originally Posted by airwolf9090 View Post
If i had the money i would but all the local shops want $200 to do it. And every junk yard around here lifts from the side making driveshafts unusable and the 1 place that lifts from the front don't have what i need and the one place stateboro jeep junkyard wants about $150 for a Driveshaft.... Its driving me nuts....
you can buy a whole new shaft for that kind of money. even the way overpriced shop around here don't charge that much for a cut and balance on a rear shaft. they want 275 for a front cut and balance though.

that's why i do my own.
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Unread 01-28-2013, 07:48 PM   #1497
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Originally Posted by ratmonkey View Post
you can buy a whole new shaft for that kind of money. even the way overpriced shop around here don't charge that much for a cut and balance on a rear shaft. they want 275 for a front cut and balance though.

that's why i do my own.
Just curious, earlier you said to only cut the shaft and not the output of the tcase, why is that?
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Unread 01-28-2013, 08:08 PM   #1498
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Can't you cut the slip yoke on the driveshaft? I've heard numerous success stories going this route. I've heard an inch to an inch and a half is best.
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Unread 01-28-2013, 08:25 PM   #1499
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Originally Posted by ejschultz
Can't you cut the slip yoke on the driveshaft? I've heard numerous success stories going this route. I've heard an inch to an inch and a half is best.
If you cut the slip yoke only the output shaft will still bottom out in the yoke. The best option is having your drive shaft cut down. I had mine cut down and balanced for $40 cash each. They said 80 I said I have 2 how about 40 a piece no special treatment just cut, welded and balanced... Deal!
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Unread 01-28-2013, 08:51 PM   #1500
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I'm hoping between my rear adjustable upper arms, my shaft, and the donor shaft, I'll get away without having to get one cut.
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