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Car Forum / Jeep / March 2007

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transfer case determination

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petethepirate - 10 Mar 2007 20:26 GMT
how do i tell what transfer case i have?  I have a 94 ZJ laredo with
the I6, with 2hi, 4hi, neutral, and 4lo
Carl S - 10 Mar 2007 20:31 GMT
NP231.

Carl

> how do i tell what transfer case i have?  I have a 94 ZJ laredo with
> the I6, with 2hi, 4hi, neutral, and 4lo
philthy - 11 Mar 2007 14:29 GMT
do u  you need one ?
i have one on the bench getting ready for a set new of synco's

> NP231.
>
> Carl
>
> > how do i tell what transfer case i have?  I have a 94 ZJ laredo with
> > the I6, with 2hi, 4hi, neutral, and 4lo
DougW - 10 Mar 2007 20:36 GMT
> how do i tell what transfer case i have?  I have a 94 ZJ laredo with
> the I6, with 2hi, 4hi, neutral, and 4lo

NP231 "Command Trac"
http://www.novak-adapt.com/knowledge/np231.htm

It's a "part time" system.  So you only want to use 2H on hard
surfaces.  4H and 4L are for offroad/dirt/gravel only and will
damage the xfr case if you run it on hard surfaces.

Signature

DougW

Jeff Strickland - 10 Mar 2007 20:45 GMT
> how do i tell what transfer case i have?  I have a 94 ZJ laredo with
> the I6, with 2hi, 4hi, neutral, and 4lo

You have the NP231.

Never use any 4WD selection on hard surfaces where the tires can get a good
grip. 4WD is intended for traction challenged conditions only.
abomb69 - 11 Mar 2007 00:43 GMT
Would and NP231 be what I have in my 93 Cherokee?

>> how do i tell what transfer case i have?  I have a 94 ZJ laredo with
>> the I6, with 2hi, 4hi, neutral, and 4lo
[quoted text clipped - 3 lines]
> Never use any 4WD selection on hard surfaces where the tires can get a
> good grip. 4WD is intended for traction challenged conditions only.
Jeff Strickland - 11 Mar 2007 02:29 GMT
Yes, it should be. Either that or the NP232. The difference is that the 232
is a Full time system with a Center Differential of sorts, wheras the 231 is
a Part Time system that has no center diff.

As you drive, the differentials in the axles handle the speed differences
from left to right on the same axle. In 4WD, the front and rear axles travel
much different lines (arcs) and the speed of the front and rear axles are
vastly different. The Center Differential accomodates this difference,
without it the transfer case takes a beating and eventually fails.

> Would and NP231 be what I have in my 93 Cherokee?
>
[quoted text clipped - 5 lines]
>> Never use any 4WD selection on hard surfaces where the tires can get a
>> good grip. 4WD is intended for traction challenged conditions only.
RoyJ - 11 Mar 2007 04:42 GMT
Mechanically, the NP231 and NP231 use very similar gear cases. The NP231
has a planitary gear setup for high/lo range and the NP232 has a
diferential gear in the same location.

> Yes, it should be. Either that or the NP232. The difference is that the
> 232 is a Full time system with a Center Differential of sorts, wheras
[quoted text clipped - 16 lines]
>>> Never use any 4WD selection on hard surfaces where the tires can get
>>> a good grip. 4WD is intended for traction challenged conditions only.
philthy - 11 Mar 2007 14:36 GMT
the np 231 and the np231 share the same case??????

> Mechanically, the NP231 and NP231 use very similar gear cases. The NP231
> has a planitary gear setup for high/lo range and the NP232 has a
[quoted text clipped - 20 lines]
> >>> Never use any 4WD selection on hard surfaces where the tires can get
> >>> a good grip. 4WD is intended for traction challenged conditions only.
RoyJ - 11 Mar 2007 16:41 GMT
No, the design is very similar but the cases are not quite the same.
Fair number of interchangable parts.

> the np 231 and the np231 share the same case??????
>
[quoted text clipped - 22 lines]
>>>>>Never use any 4WD selection on hard surfaces where the tires can get
>>>>>a good grip. 4WD is intended for traction challenged conditions only.
Jeff Strickland - 12 Mar 2007 00:21 GMT
You meant 231 and 232, you said 231 and 231.

> No, the design is very similar but the cases are not quite the same. Fair
> number of interchangable parts.
[quoted text clipped - 25 lines]
>>>>>>Never use any 4WD selection on hard surfaces where the tires can get
>>>>>>a good grip. 4WD is intended for traction challenged conditions only.
RoyJ - 12 Mar 2007 01:08 GMT
ARGH!!!!!!

> You meant 231 and 232, you said 231 and 231.
>
[quoted text clipped - 33 lines]
>>>>>>> a good grip. 4WD is intended for traction challenged conditions
>>>>>>> only.
abomb69 - 11 Mar 2007 14:26 GMT
I wish I had full time 4x4. I do have the 231.

> Yes, it should be. Either that or the NP232. The difference is that the
> 232 is a Full time system with a Center Differential of sorts, wheras the
[quoted text clipped - 16 lines]
>>> Never use any 4WD selection on hard surfaces where the tires can get a
>>> good grip. 4WD is intended for traction challenged conditions only.
Carl S - 11 Mar 2007 19:51 GMT
I have the 242 and I LOVE it.

Carl

>I wish I had full time 4x4. I do have the 231.
>
[quoted text clipped - 18 lines]
>>>> Never use any 4WD selection on hard surfaces where the tires can get a
>>>> good grip. 4WD is intended for traction challenged conditions only.
 
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