NP231 from TJ into YJ?
 

I'm replacing a dead NP231J transfer case in my '92 YJ (4.0L, 5 speed).
There seem to be a large number of used, low-mileage TJ-version NP231's
around, which leads me to the following questions regarding interchanging
between the YJ and TJ versions:
1. Other than the fluid-retension setup, are there any differences between
these two versions that would be issues in using a TJ version on a YJ?
2. Barring major incompatabilities above, what adaptations need to happen to
use a TJ case on a YJ?
3. Are there issues with a TJ case, SYE kit and CV driveshaft in a YJ?

I've got the old transfer case out, so I'd appreciate the group's opinions
on this setup, particularly from anyone who has done it.

Thanks!
Dave

Re: NP231 from TJ into YJ?
 

In article <Ol59b.13885$NX3.5158@nwrddc01.gnilink.net>, "Mighty Monad"
<mighty_monad@spammer.go.awaywolftechnology.net> writes:

>1. Other than the fluid-retension setup, are there any differences between
>these two versions that would be issues in using a TJ version on a YJ?

I don't think there will be any functional differences.

>2. Barring major incompatabilities above, what adaptations need to happen to
>use a TJ case on a YJ?

Possibly shifter-lever opening trimming, unless you are able to use the
existing YJ shift lever, which I am pretty sure you can.

>3. Are there issues with a TJ case, SYE kit and CV driveshaft in a YJ?

Driveshaft length...you'd probably install the case to measure for the new
driveshaft, and pinion angle..you'd have to install wedge inserts to correct
the pinion angle for the new driveshaft.
* * *
Matt Macchiarolo
www.townpeddler.com
www.wolverine4wd.org
http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

In article <Ol59b.13885$NX3.5158@nwrddc01.gnilink.net>, "Mighty Monad"
<mighty_monad@spammer.go.awaywolftechnology.net> writes:

>1. Other than the fluid-retension setup, are there any differences between
>these two versions that would be issues in using a TJ version on a YJ?

I don't think there will be any functional differences.

>2. Barring major incompatabilities above, what adaptations need to happen to
>use a TJ case on a YJ?

Possibly shifter-lever opening trimming, unless you are able to use the
existing YJ shift lever, which I am pretty sure you can.

>3. Are there issues with a TJ case, SYE kit and CV driveshaft in a YJ?

Driveshaft length...you'd probably install the case to measure for the new
driveshaft, and pinion angle..you'd have to install wedge inserts to correct
the pinion angle for the new driveshaft.
* * *
Matt Macchiarolo
www.townpeddler.com
www.wolverine4wd.org
http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

Hi Dave,
Might look to see if it still has a threaded hole for your vacuum
switch: http://www.off-road.com/jeep/reviews.../np231-vac.jpg
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Mighty Monad wrote:
>
> I'm replacing a dead NP231J transfer case in my '92 YJ (4.0L, 5 speed).
> There seem to be a large number of used, low-mileage TJ-version NP231's
> around, which leads me to the following questions regarding interchanging
> between the YJ and TJ versions:
> 1. Other than the fluid-retension setup, are there any differences between
> these two versions that would be issues in using a TJ version on a YJ?
> 2. Barring major incompatabilities above, what adaptations need to happen to
> use a TJ case on a YJ?
> 3. Are there issues with a TJ case, SYE kit and CV driveshaft in a YJ?
>
> I've got the old transfer case out, so I'd appreciate the group's opinions
> on this setup, particularly from anyone who has done it.
>
> Thanks!
> Dave

Re: NP231 from TJ into YJ?
 

Hi Dave,
Might look to see if it still has a threaded hole for your vacuum
switch: http://www.off-road.com/jeep/reviews.../np231-vac.jpg
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Mighty Monad wrote:
>
> I'm replacing a dead NP231J transfer case in my '92 YJ (4.0L, 5 speed).
> There seem to be a large number of used, low-mileage TJ-version NP231's
> around, which leads me to the following questions regarding interchanging
> between the YJ and TJ versions:
> 1. Other than the fluid-retension setup, are there any differences between
> these two versions that would be issues in using a TJ version on a YJ?
> 2. Barring major incompatabilities above, what adaptations need to happen to
> use a TJ case on a YJ?
> 3. Are there issues with a TJ case, SYE kit and CV driveshaft in a YJ?
>
> I've got the old transfer case out, so I'd appreciate the group's opinions
> on this setup, particularly from anyone who has done it.
>
> Thanks!
> Dave

Re: NP231 from TJ into YJ?
 

On Sun, 14 Sep 2003 21:47:26 UTC "Mighty Monad"
<mighty_monad@spammer.go.awaywolftechnology.net> wrote:

> I'm replacing a dead NP231J transfer case in my '92 YJ (4.0L, 5 speed).
> There seem to be a large number of used, low-mileage TJ-version NP231's
> around, which leads me to the following questions regarding interchanging
> between the YJ and TJ versions:
> 1. Other than the fluid-retension setup, are there any differences between
> these two versions that would be issues in using a TJ version on a YJ?
> 2. Barring major incompatabilities above, what adaptations need to happen to
> use a TJ case on a YJ?
> 3. Are there issues with a TJ case, SYE kit and CV driveshaft in a YJ?
>
> I've got the old transfer case out, so I'd appreciate the group's opinions
> on this setup, particularly from anyone who has done it.

Only potential issue I can see - besides the new driveshaft - would be
the spline count on the input shaft to the tc. I think it's the same
but it could differ between auto/manual versions.

--
Will Honea <whonea@codenet.net>

Re: NP231 from TJ into YJ?
 

On Sun, 14 Sep 2003 21:47:26 UTC "Mighty Monad"
<mighty_monad@spammer.go.awaywolftechnology.net> wrote:

> I'm replacing a dead NP231J transfer case in my '92 YJ (4.0L, 5 speed).
> There seem to be a large number of used, low-mileage TJ-version NP231's
> around, which leads me to the following questions regarding interchanging
> between the YJ and TJ versions:
> 1. Other than the fluid-retension setup, are there any differences between
> these two versions that would be issues in using a TJ version on a YJ?
> 2. Barring major incompatabilities above, what adaptations need to happen to
> use a TJ case on a YJ?
> 3. Are there issues with a TJ case, SYE kit and CV driveshaft in a YJ?
>
> I've got the old transfer case out, so I'd appreciate the group's opinions
> on this setup, particularly from anyone who has done it.

Only potential issue I can see - besides the new driveshaft - would be
the spline count on the input shaft to the tc. I think it's the same
but it could differ between auto/manual versions.

--
Will Honea <whonea@codenet.net>

Re: NP231 from TJ into YJ?
 

In article <3F661145.C2C77D47@cox.net>, L.W.(=?iso-8859-1?Q?=DFill?=) ------
III <----------@cox.net> writes:

>Hi Dave,
> Might look to see if it still has a threaded hole for your vacuum

DOH! Forgot about that damn vacuum disconnect! My advice...remove it and either
install a cable-actuated disconnect or a solid axleshaft, like Real Jeeps use
:-)
* * *
Matt Macchiarolo
www.townpeddler.com
www.wolverine4wd.org
http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

In article <3F661145.C2C77D47@cox.net>, L.W.(=?iso-8859-1?Q?=DFill?=) ------
III <----------@cox.net> writes:

>Hi Dave,
> Might look to see if it still has a threaded hole for your vacuum

DOH! Forgot about that damn vacuum disconnect! My advice...remove it and either
install a cable-actuated disconnect or a solid axleshaft, like Real Jeeps use
:-)
* * *
Matt Macchiarolo
www.townpeddler.com
www.wolverine4wd.org
http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

Sounds like a good excuse to me.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Matt Macchiarolo wrote:
>
> DOH! Forgot about that damn vacuum disconnect! My advice...remove it and either
> install a cable-actuated disconnect or a solid axleshaft, like Real Jeeps use
> :-)
> * * *
> Matt Macchiarolo
> www.townpeddler.com
> www.wolverine4wd.org
> http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

Sounds like a good excuse to me.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Matt Macchiarolo wrote:
>
> DOH! Forgot about that damn vacuum disconnect! My advice...remove it and either
> install a cable-actuated disconnect or a solid axleshaft, like Real Jeeps use
> :-)
> * * *
> Matt Macchiarolo
> www.townpeddler.com
> www.wolverine4wd.org
> http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

Thanks, Bill, Matt, and Will. I've got a line on a replacement case from a
'99 TJ with only 14k on it, SYE already installed. It appears to have the
appropriate vacuum connections, so I'll try to reuse that system first. If
it doesn't work out, I'll go with the cable disconnect. In any event, I'll
report back to the group how it went and if I came across any issues along
the way.

Dave

Re: NP231 from TJ into YJ?
 

Thanks, Bill, Matt, and Will. I've got a line on a replacement case from a
'99 TJ with only 14k on it, SYE already installed. It appears to have the
appropriate vacuum connections, so I'll try to reuse that system first. If
it doesn't work out, I'll go with the cable disconnect. In any event, I'll
report back to the group how it went and if I came across any issues along
the way.

Dave

Re: NP231 from TJ into YJ?
 

In article <pan.2003.09.16.02.41.25.68015@spammergohome.wolft echnology.net>,
"David Pinaula" <david.pinaula@spammergohome.wolftechnology.net> writes:

>It appears to have the
>appropriate vacuum connections, so I'll try to reuse that system first. If
>it doesn't work out, I'll go with the cable disconnect.

Go ahead and order that cable disconnect. The TJ cases don't have any vacuum
connections, only speed sensor and range light switches.
* * *
Matt Macchiarolo
www.townpeddler.com
www.wolverine4wd.org
http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

In article <pan.2003.09.16.02.41.25.68015@spammergohome.wolft echnology.net>,
"David Pinaula" <david.pinaula@spammergohome.wolftechnology.net> writes:

>It appears to have the
>appropriate vacuum connections, so I'll try to reuse that system first. If
>it doesn't work out, I'll go with the cable disconnect.

Go ahead and order that cable disconnect. The TJ cases don't have any vacuum
connections, only speed sensor and range light switches.
* * *
Matt Macchiarolo
www.townpeddler.com
www.wolverine4wd.org
http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

Where does the '4wd' light hook into? I thought the TJ had a switch in the same
hole as the vac switch fit in.

Matt Macchiarolo wrote:

> In article <pan.2003.09.16.02.41.25.68015@spammergohome.wolft echnology.net>,
> "David Pinaula" <david.pinaula@spammergohome.wolftechnology.net> writes:
>
> >It appears to have the
> >appropriate vacuum connections, so I'll try to reuse that system first. If
> >it doesn't work out, I'll go with the cable disconnect.
>
> Go ahead and order that cable disconnect. The TJ cases don't have any vacuum
> connections, only speed sensor and range light switches.
> * * *
> Matt Macchiarolo
> www.townpeddler.com
> www.wolverine4wd.org
> http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

Where does the '4wd' light hook into? I thought the TJ had a switch in the same
hole as the vac switch fit in.

Matt Macchiarolo wrote:

> In article <pan.2003.09.16.02.41.25.68015@spammergohome.wolft echnology.net>,
> "David Pinaula" <david.pinaula@spammergohome.wolftechnology.net> writes:
>
> >It appears to have the
> >appropriate vacuum connections, so I'll try to reuse that system first. If
> >it doesn't work out, I'll go with the cable disconnect.
>
> Go ahead and order that cable disconnect. The TJ cases don't have any vacuum
> connections, only speed sensor and range light switches.
> * * *
> Matt Macchiarolo
> www.townpeddler.com
> www.wolverine4wd.org
> http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

In article <3F67E6D5.5330D0E6@qwest.net>, Roy Jenson <rkjenson@qwest.net>
writes:

>Where does the '4wd' light hook into? I thought the TJ had a switch in the
>same
>hole as the vac switch fit in.
>
>Matt Macchiarolo wrote:

Could be, having not owned a YJ I don't know. The 4wd light switch is on the
left side, just above the range lever.
* * *
Matt Macchiarolo
www.townpeddler.com
www.wolverine4wd.org
http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

In article <3F67E6D5.5330D0E6@qwest.net>, Roy Jenson <rkjenson@qwest.net>
writes:

>Where does the '4wd' light hook into? I thought the TJ had a switch in the
>same
>hole as the vac switch fit in.
>
>Matt Macchiarolo wrote:

Could be, having not owned a YJ I don't know. The 4wd light switch is on the
left side, just above the range lever.
* * *
Matt Macchiarolo
www.townpeddler.com
www.wolverine4wd.org
http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

Hi Matt,
That's the only logical place for a warning light switch to be
right on top of the shift fork slide rod, just like the vacuum switch:
http://www.off-road.com/jeep/reviews.../np231-vac.jpg Real
Jeep designers believed their drivers were intelligent and didn't need
an idiot light to tell them what gear they're in.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Matt Macchiarolo wrote:
>
> Could be, having not owned a YJ I don't know. The 4wd light switch is on the
> left side, just above the range lever.
> * * *
> Matt Macchiarolo
> www.townpeddler.com
> www.wolverine4wd.org
> http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

Hi Matt,
That's the only logical place for a warning light switch to be
right on top of the shift fork slide rod, just like the vacuum switch:
http://www.off-road.com/jeep/reviews.../np231-vac.jpg Real
Jeep designers believed their drivers were intelligent and didn't need
an idiot light to tell them what gear they're in.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Matt Macchiarolo wrote:
>
> Could be, having not owned a YJ I don't know. The 4wd light switch is on the
> left side, just above the range lever.
> * * *
> Matt Macchiarolo
> www.townpeddler.com
> www.wolverine4wd.org
> http://wolverine4wd.org/rigs/macchiarolo_ml.html

Re: NP231 from TJ into YJ?
 

On Sun, 14 Sep 2003 22:45:02 +0000, Matt Macchiarolo wrote:

> In article <Ol59b.13885$NX3.5158@nwrddc01.gnilink.net>, "Mighty Monad"
> <mighty_monad@spammer.go.awaywolftechnology.net> writes:
>
>>1. Other than the fluid-retension setup, are there any differences between
>>these two versions that would be issues in using a TJ version on a YJ?
>
> I don't think there will be any functional differences.

Just make sure they're both from a 6 cyl, or both from a 4 cyl......or
tranny, etc.

4cyl manual are 21 spline input, 6 cyl manual are 23 spline, and all autos
are the same but I can't remember whether they're all 21 or all 23.

Paul

Re: NP231 from TJ into YJ?
 

On Sun, 14 Sep 2003 22:45:02 +0000, Matt Macchiarolo wrote:

> In article <Ol59b.13885$NX3.5158@nwrddc01.gnilink.net>, "Mighty Monad"
> <mighty_monad@spammer.go.awaywolftechnology.net> writes:
>
>>1. Other than the fluid-retension setup, are there any differences between
>>these two versions that would be issues in using a TJ version on a YJ?
>
> I don't think there will be any functional differences.

Just make sure they're both from a 6 cyl, or both from a 4 cyl......or
tranny, etc.

4cyl manual are 21 spline input, 6 cyl manual are 23 spline, and all autos
are the same but I can't remember whether they're all 21 or all 23.

Paul