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Old 09-26-2007, 11:29 AM   #1
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T case questions

I am buying a Chrokee for the t-case and 4.0 and have some questions someone might be able to answer. The guy I'm getting it from has a few of them. One has the part time and full time t-case, the other just has the part time. I assume the part time t-case is the NP231 that I am looking for, but what is the other one. The Jeep with the FT-PT t-case has the one piece passenger side axle that I want to get rid of my CAD. It was also was a police vehicle and supposedly has an upgraded chip in it. I need to know which Jeep to buy...maybe I should just buy both.

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Old 09-26-2007, 02:08 PM   #2
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What year is the XJ? If it has a V6 it might not work with the YJ. I donno about the spline count inputs, but I know some are different.


XJ Transfer Cases
* 1984-1987 New Process NP207 "Command-Trac", part-time only, 2.61:1 ratio with low range
* 1984-1987 New Process NP228/NP229 "Selec-Trac", full-time/part-time
* 1987-2001 New Process NP231 "Command-Trac", part-time only, 2.72:1 ratio with low range
* 1987-2001 New Process NP242 "Selec-Trac", full-time/part-time, 2.72:1 ratio with low range

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Old 09-26-2007, 02:41 PM   #3
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Thanks for the reply

I'm looking for the 231...correct? That is the one that I can get an SYE for and maybe upgrade gearing later. I don't know if there are advantages to the other units for a mostly trail use Jeep. The whole reason for finding a new t-case is because the POS NP207 in my Jeep now has no upgrade options.

I have no idea yet what the years are for the Jeeps. I am looking at them this weekend. And they do have the 4.0...it would be kinda hard to build a stroker with my 4.2 crank and a V6.
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Old 09-26-2007, 04:37 PM   #4
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Yah - your looking for the 231, and it should be bolted to a 4.0L. The only advantage to the Selec-Trac(242) is the full time 4wd for seasonal areas(lots of snow or rain) But with any other mods to the vehicle, it quickly becomes the weakest link.
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Old 09-26-2007, 06:01 PM   #5
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Both the 207 and the 231 were 23 spline inputs behind the Auto's. So you shouldn't have a problem there if you are just swapping the cases out.
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Old 09-26-2007, 06:02 PM   #6
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Ah Thanks Jack - I couldn't find the info nor remember if they were the same.
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Old 09-26-2007, 06:03 PM   #7
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Ah Thanks Jack - I couldn't find the info nor remember if they were the same.
No worries. 207's were also both 21 and 23. They put the 21 spline in the manuals and the 23 in the auto's. So I would assume in 87 that's the Pugeot manual right?
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Old 09-26-2007, 06:09 PM   #8
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In an XJ/MJ? Yah.
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Old 09-26-2007, 06:50 PM   #9
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In an XJ/MJ? Yah.
YJ's also. DaddyJeep's is an 87.
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Old 09-26-2007, 06:51 PM   #10
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Old 09-26-2007, 07:17 PM   #11
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whats the difference between part and full time settings anyways?
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Old 09-26-2007, 07:22 PM   #12
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Part-time is only meant to be used in off-road applications and full-time is like an AWD and can be used on-road.
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Old 09-27-2007, 06:10 AM   #13
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The 207 wouldn't do me any good since I already have one. Thanks for the help guys. That is what I thought, but I wanted to be sure I wasn't missing anything.

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