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Old 06-04-2010, 05:58 PM   #1
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TJ np 231 swaped into a yj

i want to swap a 1998 np 231 into a 1994 yj. what would i have to do to make this work? the splines are the same the only thing different is the vacum correct? whats up with that?

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Old 06-04-2010, 06:16 PM   #2
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I think you are correct. You can bye pass the vacuum, by:1. fixing the internal arm in the locked position. 2. 4x4 posi lock 3. replace two section shaft with a 1pc from a xj or tj, however with this you also have to replace some inner seals in the axle.

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Old 06-04-2010, 06:55 PM   #3
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is there anyway you can use the old vacum thing?
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Old 06-04-2010, 07:08 PM   #4
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Quote:
Originally Posted by mikeyford3 View Post
is there anyway you can use the old vacum thing?
not sure...with the newer t-case.
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Old 06-04-2010, 07:38 PM   #5
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well i mean the transfer case is the transfer case it has nothing to do with teh vacuum line correct? the vacuum line only deals with the front axle engaging and de-engaging the 4x4. There has to be a away if the vacuum lines worked before to make them work again. Does anyone know what the vacuum sensor/regulator thing do on the actual transfercase itsself?
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Old 06-04-2010, 08:47 PM   #6
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couldnt i just use the vacuum switch off my old transmission and let it just be there? does it need to be installed in the transfercase?
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Old 06-04-2010, 10:50 PM   #7
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to work it does. detent on the bottom opens and closes switch. easy fix leave it off and go posi locker. or look to see if the tj 231 might have a plug where that switch goes, but not likely.

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