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  #1  
Old July 14th, 2005, 04:32
xjjeepman's Avatar
xjjeepman xjjeepman is offline
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np 231 t-case

I have a question! I have a 91 xj and I need to replace my np231 t-case. Can anyone tell me if a np 231 t-case out of a 97 tj will work in my 91 xj
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Old July 14th, 2005, 04:53
Moore4X4 Moore4X4 is offline
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Re: np 231 t-case

Your number one concern is going to be the spline count. Make sure that the input shaft on the T-case and the output shaft of the tranny are the same count. It would be better if the donor vehicle had the same tranny as your XJ, mainly for driveshaft lentgh matching...

Not sure if in 97 the TJ's had a driver output or a passenger output T-case. I know jeep seemed to enjoy changing stuff up mid-year.

Just my 2 cents...
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Old July 14th, 2005, 23:45
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Yucca-Man Yucca-Man is offline
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Re: np 231 t-case

Quote:
Originally Posted by Moore4X4
Your number one concern is going to be the spline count. Make sure that the input shaft on the T-case and the output shaft of the tranny are the same count. It would be better if the donor vehicle had the same tranny as your XJ, mainly for driveshaft lentgh matching...

Not sure if in 97 the TJ's had a driver output or a passenger output T-case. I know jeep seemed to enjoy changing stuff up mid-year.

Just my 2 cents...
TJs use the same front axle configuration and NP231 t-case - driver's drop. The TJ will have a 23-spline input so you will have to verify the count on the output of your tranny...my understanding is that if you have a 5-speed it should be 23-spline as well but it could be a tossup if you have an auto...
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