Transfer Case Swap Info NP249->NP231 & NP242 - Page 63 - JeepForum.com
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Unread 11-27-2011, 05:11 PM   #931
comptiger5000
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Squazz - Motor oil (5W-30 or similar) won't hurt the 242 at all.

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Unread 11-27-2011, 06:49 PM   #932
JrMechanic
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Quote:
Originally Posted by comptiger5000 View Post
Squazz - Motor oil (5W-30 or similar) won't hurt the 242 at all.
Motor oil won't hurt, but it needs changed much more often. Motor oil doesn't have near the amount of detergents and cleaning agents ATF has so the case won't stay nearly as clean.
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Want to swap an NP242 or NP231 into your ZJ? Here's how:
http://www.jeepforum.com/forum/f13/n...pdated-685644/
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Unread 11-27-2011, 10:12 PM   #933
comptiger5000
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The t-case doesn't have much dirt introduced to the oil, so detergents aren't a concern (plus, the ATF having more detergents thing hasn't applied since the mid 90s, modern oils have a lot more detergent than older ones). The reason it needs frequent changing is that it's not designed to stand up to continued pressure from gear drives, etc, so the pressure additives wear out faster.
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Unread 11-30-2011, 10:47 AM   #934
klindzy3
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Ok guys so i have a 1993 jeep grand cherokee limited 5.2 V8 with the 4hi N 4lo options. I need to replace the transfer case because it is majorly cracked and winter is coming fast. I need to know what kind of transfer case this jeep take and if any one has any suggestions to a modified tcase or a t case change. Ive herd a lot about the 242. Will this work in my jeep? let me know
thanks
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Unread 11-30-2011, 01:56 PM   #935
steeleman3
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Quote:
Originally Posted by klindzy3
Ok guys so i have a 1993 jeep grand cherokee limited 5.2 V8 with the 4hi N 4lo options. I need to replace the transfer case because it is majorly cracked and winter is coming fast. I need to know what kind of transfer case this jeep take and if any one has any suggestions to a modified tcase or a t case change. Ive herd a lot about the 242. Will this work in my jeep? let me know
thanks
I believe you can get a 242 that will bolt up as long as it has the same input shaft length and spline. I have same 93 v8, they should have 23 spline with 1.55" input shaft I believe. If you're looking for the 231 there is no direct swap, you will have to swap input shafts. There is a gear cut change mid 94 for the input shaft so look for a case made before that if you're swapping inputs. Stay pre-95 on all transfer cases.
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Unread 11-30-2011, 11:24 PM   #936
squazz
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So I did this after swaping in the 242

and in every position it says "service 4wd switch" am I doing it wrong? or could the switch be faulty? Will the 249 switch work?
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Unread 12-02-2011, 09:36 AM   #937
Midnightluckey
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Quote:
Originally Posted by steeleman3

I believe you can get a 242 that will bolt up as long as it has the same input shaft length and spline. I have same 93 v8, they should have 23 spline with 1.55" input shaft I believe. If you're looking for the 231 there is no direct swap, you will have to swap input shafts. There is a gear cut change mid 94 for the input shaft so look for a case made before that if you're swapping inputs. Stay pre-95 on all transfer cases.
For early (93-95) v8's, there is NO bolt in swap besides another early np249 due to the required input shaft length into the 46rh trans found in these early v8's. You WILL have to do some input shaft swapping or case half swapping to get anything but another 249. And I believe the gear cut change started showing up around March or April of 1994, so be sure to check the tag on the rear of the case and get the date.
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Unread 12-02-2011, 12:01 PM   #938
steeleman3
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Quote:
Originally Posted by Midnightluckey

For early (93-95) v8's, there is NO bolt in swap besides another early np249 due to the required input shaft length into the 46rh trans found in these early v8's. You WILL have to do some input shaft swapping or case half swapping to get anything but another 249. And I believe the gear cut change started showing up around March or April of 1994, so be sure to check the tag on the rear of the case and get the date.
Ok my bad. Had a feeling there was NO direct swap but thought I saw somewhere that said there was a 242 with 1.55 input shaft. Thank you tho.

As for the swap, are there pros/cons to swapping the front half vs the input shaft, or is it just a convenience thing?
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Unread 12-02-2011, 12:17 PM   #939
Midnightluckey
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Quote:
Originally Posted by steeleman3

Ok my bad. Had a feeling there was NO direct swap but thought I saw somewhere that said there was a 242 with 1.55 input shaft. Thank you tho.

As for the swap, are there pros/cons to swapping the front half vs the input shaft, or is it just a convenience thing?
It's a gear cut thing. If you've got an old (93) 249 and a, say, 95 242, the gear cuts are different on the inputs, so you can't swap them. But you can swap the whole front halves of 242's and 249's with relative ease, allowing you to use your front half of your 249 with correct input on a rear half of a 242.
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Unread 12-02-2011, 12:35 PM   #940
steeleman3
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Quote:
Originally Posted by Midnightluckey

It's a gear cut thing. If you've got an old (93) 249 and a, say, 95 242, the gear cuts are different on the inputs, so you can't swap them. But you can swap the whole front halves of 242's and 249's with relative ease, allowing you to use your front half of your 249 with correct input on a rear half of a 242.
Oh ok I gotcha. Didn't know if the gear cut affected that or not.
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Unread 12-04-2011, 09:03 AM   #941
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so i picked up a 231 J out of a 93 xj today. the tag says 231 J but i thought these had a rubber boot on them compared to the 231 which didnt? will it still work? i plan on swapping the input shafts with the one in my 249.

edit: and can i use the shifter handle from my 249? cause the guy didnt give me the one out of his xj, thanks

edit again: and how much, if any, tranny fluid will leak out of the tranny when i separate that and the t-case? i just spent $100 on atf for my tranny and i dont want any leaking out
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Unread 12-04-2011, 01:11 PM   #942
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Originally Posted by Freestyle713 View Post
so i picked up a 231 J out of a 93 xj today. the tag says 231 J but i thought these had a rubber boot on them compared to the 231 which didnt? will it still work? i plan on swapping the input shafts with the one in my 249.

edit: and can i use the shifter handle from my 249? cause the guy didnt give me the one out of his xj, thanks

edit again: and how much, if any, tranny fluid will leak out of the tranny when i separate that and the t-case? i just spent $100 on atf for my tranny and i dont want any leaking out
You'll get some, but shouldn't be catastrophic. Replace the trans seal while it's out for good measure.

The case will still work. Driveshaft issues might come up, but the input swap should be good.

What do you mean by shifter handle? If you mean by the actual handle in the Jeep, yes. You will, however, need the tab that goes on the transfer case from the 231.
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Unread 12-04-2011, 06:56 PM   #943
Freestyle713
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Originally Posted by csouers View Post
You'll get some, but shouldn't be catastrophic. Replace the trans seal while it's out for good measure.

The case will still work. Driveshaft issues might come up, but the input swap should be good.

What do you mean by shifter handle? If you mean by the actual handle in the Jeep, yes. You will, however, need the tab that goes on the transfer case from the 231.
how much fluid are we talking? is it enough to worry about re-filling? and the case came with the tab you are talking about, so im set with that, right? and would i be able to tell if the driveshafts will fit or not before putting the case in? if they are too long or too short, can i find shafts at a jy? thanks for the info.
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Unread 12-04-2011, 08:16 PM   #944
squazz
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Originally Posted by Freestyle713 View Post
how much fluid are we talking? is it enough to worry about re-filling?.
All depends how much of an angle you leave the trans on after removing the crossmember I lost about a quart the seal was easy and cost about 10$
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Unread 12-04-2011, 08:40 PM   #945
Freestyle713
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Originally Posted by squazz View Post
All depends how much of an angle you leave the trans on after removing the crossmember I lost about a quart the seal was easy and cost about 10$
i have a set of car ramps i was planning on using. if i drive the rear wheels onto them to get the back end up more than the front, would i lose less fluid? or would it not make a difference?
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