NP207 VS NP231 - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 11-10-2000, 05:57 AM
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NP207 VS NP231

<font color=blue>I have a qustions about the np207 and the np231. I own a 88 s10 pick up with the 2.8 in it and the 700R4. I got a 89 s10 blazer with the 4.3 in it and it also has a 700R4 (for parts). My truck has the np207. The blazer has a np231. Can any one tell me the diff in the two t-cases? And also can I put the np231 in my truckon my tranny. I do plan to put the 4.3 in and the tranny but I think my t-case is going out so I need to do that now. I did a search for the info but I could not find any thing that would help me.
Thanks,
Diesel22</font color=blue>

<font color=blue>Jeff Henderson
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post #2 of (permalink) Old 11-10-2000, 08:36 AM
 
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Re: NP207 VS NP231

From the Jeep BBS (they had both 207 and 231 cases for a while), I was able to gather that a 231 is an updated version of the 207. From that I'd assume that it would bolt up. You can measure the distance between the holes to fasten it up to the tranny. If they're about the same then you'd have to check spline count (actually spline count should be the same since they're on the same tranny)...

I'm interested in what it takes to swap them also, so any info you can post as you go and when you finish up would be great if possible... [img]/wwwthreads_images/icons/cool.gif[/img]

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post #3 of (permalink) Old 11-10-2000, 08:48 AM
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Re: NP207 VS NP231

<font color=blue>Will do, I just wanted to try to find some info out before i took it all apart.
Diesel22</font color=blue>

<font color=blue>Jeff Henderson
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post #4 of (permalink) Old 11-10-2000, 08:59 AM
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Re: NP207 VS NP231

From what I've heard the 231 is much more desirable then the 207. It is supposed to be alot stronger and I belive has slighty lower gear ratio. I have never done this swap but I am almost positive it will bolt right up. Goodluck and let us know what you find out.

Nick
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post #5 of (permalink) Old 11-10-2000, 01:12 PM
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Re: NP207 VS NP231

Jeff,
The 231 and 207 cases are a direct fit... The 231 has a thicker/wider chain/gears and something is different on the lubrication passages (not sure exactly what) but thats about it... There is a gear ratio difference but it is very minimal... If anyone thinks the 231 case is weak, don't, its holding up to over 400+ ponies with 38s... For a supposedly weak transfer-case it is holding up well to my bashing it...

Bad-Bowtie,
M.Hall
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post #6 of (permalink) Old 11-10-2000, 01:27 PM
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Re: NP207 VS NP231

The 231C has a 1.25" chain, pressure lubercation, and 2.72 low range.

The 207C has a 1" chain, splash lubercation, and 2.60 low range.

The 231C is basically an updated and stronger 207C. BTW, the 231J and 207J (j**p) are different. I'm not sure what all the differences are, but the 4:1 low range for the 231J will not fit the 231C without major modification.





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post #7 of (permalink) Old 11-11-2000, 11:07 AM
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Re: NP207 VS NP231

The 207 uses splash lubrication, while the 231uses pressurized. I've heard that you can use a 241 chain in a 231 to strengthen it further(wider chain). I'm keepin the 207 in my 85 till it gives me trouble. I've had no trouble with my 231 even after hard wheelin and 173K miles.
>A.S.

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