NP249 Input shaft Compatible with AX15/NP231 Combo? - JeepForum.com

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post #1 of 20 Old 05-25-2011, 02:24 AM Thread Starter
Rynfw100
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NP249 Input shaft Compatible with AX15/NP231 Combo?

Ok here's the deal, I bought a Transfer Case thinking it was a NP231 out of a 1994 YJ, however after looking at the case, identifying the rear case part number to the transfer case (it doesn't have the identifying tag on the rear), and basically taking all the pictures I found and matching it to the transfer case, It seems to be a NP249. These were in ZJs as you all may know, and you guys switch the input shafts to make them work with 242s and 231s.

My question is this, will an input shaft out of the NP249 go into a NP231 (I know there was a change in the shafts from 1994-1995) and then the input shaft link up to an 1997 TJ AX-15 since the output shaft of the transmission is 23 spline, just like the input shaft to the NP249?

I'm just trying to justify, instead of trying to recoup my losses, seeing if the input shaft will work. Max already got the idea in my head Any help would be awesome. Thanks!

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post #2 of 20 Old 05-25-2011, 04:18 AM
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Casting numbers don't mean much when identifying cases.

Verify the number of modes the selector lever catches in. 3=249, 4=231, 5=242

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #3 of 20 Old 05-25-2011, 09:38 AM Thread Starter
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Quote:
Originally Posted by ratmonkey View Post
Casting numbers don't mean much when identifying cases.

Verify the number of modes the selector lever catches in. 3=249, 4=231, 5=242
That's not what I asked... but ok. I forgot to mention in the first post that it has 3...
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post #4 of 20 Old 05-25-2011, 09:56 AM
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Since you say it has 3, it would be a 249.. I'm not sure if the input shaft fits or not, I have no experience in that area..


Quote:
Originally Posted by Rynfw100 View Post
That's not what I asked... but ok. I forgot to mention in the first post that it has 3...
Ratmonkey is pretty damn knowledgeable in transmissions & transfer cases.. He was just letting you know another way to identify which case you have... Someone on here may be able to help you out, but I can bet that with the way your response sounds it won't be Rat, lol. Maybe it's just me, but your reply didn't sound too polite..
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post #5 of 20 Old 05-25-2011, 11:04 AM Thread Starter
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Quote:
Originally Posted by Obie95Sahara View Post
Since you say it has 3, it would be a 249.. I'm not sure if the input shaft fits or not, I have no experience in that area..




Ratmonkey is pretty damn knowledgeable in transmissions & transfer cases.. He was just letting you know another way to identify which case you have... Someone on here may be able to help you out, but I can bet that with the way your response sounds it won't be Rat, lol. Maybe it's just me, but your reply didn't sound too polite..
If it came off that way, I apologize. I'm only more or less wondering if the input shaft would be compatible with the AX-15, since I've already identified the case itself.
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post #6 of 20 Old 05-25-2011, 04:21 PM
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231, 242, and 249 all use the same input and planetary reduction sets, just with different exposed input shaft lengths that are dependent upon the TRANSMISSION they are attached to.
some cases behind 4cyl jeeps use 21 spl inputs. the reduction sets are the same so they work with 23 spline or 21 spline inputs.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #7 of 20 Old 05-25-2011, 04:27 PM Thread Starter
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Quote:
Originally Posted by ratmonkey View Post
231, 242, and 249 all use the same input and planetary reduction sets, just with different exposed input shaft lengths that are dependent upon the TRANSMISSION they are attached to.
some cases behind 4cyl jeeps use 21 spl inputs. the reduction sets are the same so they work with 23 spline or 21 spline inputs.
So Basically I have to determine if the input shaft will work with the transmission (AX-15) to use it in my case, but it should mate with the NP231?
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post #8 of 20 Old 05-25-2011, 05:35 PM
speedbucket
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someon will correct me if im wrong
if your swapping inputs then the gear cut change in mid 94 doesn't matter


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V8 zj at 6" . Double tri rear and true 3 link front. Stretched to 108"
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post #9 of 20 Old 05-26-2011, 12:28 AM Thread Starter
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someon will correct me if im wrong
if your swapping inputs then the gear cut change in mid 94 doesn't matter


Courtesy of Novak

Since the Gear cut is the one that moves on the innards of the Transfer Case, won't having the two different cuts eventually wear each other out... causing damage?
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post #10 of 20 Old 05-26-2011, 12:43 AM
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They're noisy in 2wd and hi, in low the case about locks up. Don't mix gear cuts

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #11 of 20 Old 05-26-2011, 12:58 AM Thread Starter
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Quote:
Originally Posted by ratmonkey View Post
They're noisy in 2wd and hi, in low the case about locks up. Don't mix gear cuts
Any way to determine what gear cut a shaft has? Early or Late?
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post #12 of 20 Old 05-26-2011, 06:57 AM
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by the manufacturing date on the case tag, most people say the cutoff date for the early gear cut is 94.5


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V8 zj at 6" . Double tri rear and true 3 link front. Stretched to 108"
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post #13 of 20 Old 05-26-2011, 10:33 AM Thread Starter
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Originally Posted by speedbucket View Post
by the manufacturing date on the case tag, most people say the cutoff date for the early gear cut is 94.5
No Tag on the case.
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post #14 of 20 Old 05-26-2011, 02:19 PM
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line up inputs side by side.

i think the ax-15 takes a .840 exposed input shaft. check the tj forum, they'd know better than here. the only auto grands that DIDN'T have that length exposed shaft were the early v8's.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #15 of 20 Old 05-26-2011, 02:27 PM
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Quote:
Originally Posted by ratmonkey View Post
line up inputs side by side.

i think the ax-15 takes a .840 exposed input shaft. check the tj forum, they'd know better than here. the only auto grands that DIDN'T have that length exposed shaft were the early v8's.
, which is mine (93 v8) and its got 1.5" input for the 46RH correct?


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V8 zj at 6" . Double tri rear and true 3 link front. Stretched to 108"
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