Jerry Bransford

The part-time (4Hi and 4Lo) settings mechanically lock the front and rear
axles together. They turn in lock-step with each other. This is the more
aggressive of the two modes, part and full-time, and is used for offroading.

The full-time setting couples the front and rear axles together via a
viscous (fluid) coupling, much like how an automatic transmission works.
This is a less "aggressive" 4x4 mode that allows for some slippage between
the front and rear axles that is required for paved highway use.

Jerry
--
Jerry Bransford
To email, remove 'me' from my email address
KC6TAY, PP-ASEL
See the Geezer Jeep at
http://members.***.net/jerrypb/

"Eric" <gymrat@***.net> wrote in message
news:yOmAb.10475$LV1.5850@okepread05...
> I had assumed it was one of those systems that only engaged when the
wheels
> slipped. Good news that I was wrong
>
> What is different about the full-time setting than the part time then? If
> they both engage the front axle...
>
> Thanks!
>
> Eric
>
> "Jerry Bransford" <jerrypb@mecox.net> wrote in message
> news:eKmAb.27819$Bk1.8193@fed1read05...
> > Full-time on your Cherokee means just that, full-time... both axles are
> > engaged all the time when you're in any of the 4x4 settings. Yes, the
> > full-time position is the correct one to use on the roads and its use
will
> > not damage the transfer case, that's what it was designed to do.
> >
> > Jerry
> > --
> > Jerry Bransford
> > To email, remove 'me' from my email address
> > KC6TAY, PP-ASEL
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> >
> > "Eric" <gymrat@***.net> wrote in message
> > news:5mmAb.10470$LV1.7309@okepread05...
> > > My wife has a 00 XJ with the transfer case that allows you to use 4hi,
> > 4lo,
> > > and "full time" 4wd for "all road surfaces". Or so it says. We've
been
> > > getting a bit of snow/freezing rain lately, so I put it in full-time
4wd
> > > just in case we hit some slick spots running around town.
> > >
> > > Going around corners I can tell it is in 4wd. The tires pull back and
> > forth
> > > on the pavement. I thought that the full-time selection only engaged
> the
> > > front axle when they were slipping. The manual says full-time can be
> used
> > > on all road surfaces all the time, but wouldn't this damage my
transfer
> > > case?!?
> > >
> > > Thanks!
> > >
> > > Eric
> > > 00 XJ LTD
> > >
> > >
> >
> >
>
>

Jerry Bransford

The part-time (4Hi and 4Lo) settings mechanically lock the front and rear
axles together. They turn in lock-step with each other. This is the more
aggressive of the two modes, part and full-time, and is used for offroading.

The full-time setting couples the front and rear axles together via a
viscous (fluid) coupling, much like how an automatic transmission works.
This is a less "aggressive" 4x4 mode that allows for some slippage between
the front and rear axles that is required for paved highway use.

Jerry
--
Jerry Bransford
To email, remove 'me' from my email address
KC6TAY, PP-ASEL
See the Geezer Jeep at
http://members.***.net/jerrypb/

"Eric" <gymrat@***.net> wrote in message
news:yOmAb.10475$LV1.5850@okepread05...
> I had assumed it was one of those systems that only engaged when the
wheels
> slipped. Good news that I was wrong
>
> What is different about the full-time setting than the part time then? If
> they both engage the front axle...
>
> Thanks!
>
> Eric
>
> "Jerry Bransford" <jerrypb@mecox.net> wrote in message
> news:eKmAb.27819$Bk1.8193@fed1read05...
> > Full-time on your Cherokee means just that, full-time... both axles are
> > engaged all the time when you're in any of the 4x4 settings. Yes, the
> > full-time position is the correct one to use on the roads and its use
will
> > not damage the transfer case, that's what it was designed to do.
> >
> > Jerry
> > --
> > Jerry Bransford
> > To email, remove 'me' from my email address
> > KC6TAY, PP-ASEL
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> >
> > "Eric" <gymrat@***.net> wrote in message
> > news:5mmAb.10470$LV1.7309@okepread05...
> > > My wife has a 00 XJ with the transfer case that allows you to use 4hi,
> > 4lo,
> > > and "full time" 4wd for "all road surfaces". Or so it says. We've
been
> > > getting a bit of snow/freezing rain lately, so I put it in full-time
4wd
> > > just in case we hit some slick spots running around town.
> > >
> > > Going around corners I can tell it is in 4wd. The tires pull back and
> > forth
> > > on the pavement. I thought that the full-time selection only engaged
> the
> > > front axle when they were slipping. The manual says full-time can be
> used
> > > on all road surfaces all the time, but wouldn't this damage my
transfer
> > > case?!?
> > >
> > > Thanks!
> > >
> > > Eric
> > > 00 XJ LTD
> > >
> > >
> >
> >
>
>

Jerry Bransford

The part-time (4Hi and 4Lo) settings mechanically lock the front and rear
axles together. They turn in lock-step with each other. This is the more
aggressive of the two modes, part and full-time, and is used for offroading.

The full-time setting couples the front and rear axles together via a
viscous (fluid) coupling, much like how an automatic transmission works.
This is a less "aggressive" 4x4 mode that allows for some slippage between
the front and rear axles that is required for paved highway use.

Jerry
--
Jerry Bransford
To email, remove 'me' from my email address
KC6TAY, PP-ASEL
See the Geezer Jeep at
http://members.***.net/jerrypb/

"Eric" <gymrat@***.net> wrote in message
news:yOmAb.10475$LV1.5850@okepread05...
> I had assumed it was one of those systems that only engaged when the
wheels
> slipped. Good news that I was wrong
>
> What is different about the full-time setting than the part time then? If
> they both engage the front axle...
>
> Thanks!
>
> Eric
>
> "Jerry Bransford" <jerrypb@mecox.net> wrote in message
> news:eKmAb.27819$Bk1.8193@fed1read05...
> > Full-time on your Cherokee means just that, full-time... both axles are
> > engaged all the time when you're in any of the 4x4 settings. Yes, the
> > full-time position is the correct one to use on the roads and its use
will
> > not damage the transfer case, that's what it was designed to do.
> >
> > Jerry
> > --
> > Jerry Bransford
> > To email, remove 'me' from my email address
> > KC6TAY, PP-ASEL
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> >
> > "Eric" <gymrat@***.net> wrote in message
> > news:5mmAb.10470$LV1.7309@okepread05...
> > > My wife has a 00 XJ with the transfer case that allows you to use 4hi,
> > 4lo,
> > > and "full time" 4wd for "all road surfaces". Or so it says. We've
been
> > > getting a bit of snow/freezing rain lately, so I put it in full-time
4wd
> > > just in case we hit some slick spots running around town.
> > >
> > > Going around corners I can tell it is in 4wd. The tires pull back and
> > forth
> > > on the pavement. I thought that the full-time selection only engaged
> the
> > > front axle when they were slipping. The manual says full-time can be
> used
> > > on all road surfaces all the time, but wouldn't this damage my
transfer
> > > case?!?
> > >
> > > Thanks!
> > >
> > > Eric
> > > 00 XJ LTD
> > >
> > >
> >
> >
>
>

John Davies

On Sat, 6 Dec 2003 09:43:26 -0600, "Eric" <gymrat@***.net> wrote:

>I had assumed it was one of those systems that only engaged when the wheels
>slipped. Good news that I was wrong
>
>What is different about the full-time setting than the part time then? If
>they both engage the front axle...

In Full Time you have engaged the center differential in the transfer
case, which helps to eliminate front/ rear axle binding. You can still
feel it a little as the steering wheel twitches during sharp turns.

The center diff is _not_ a limited slip in the XJ, so you can still
get one wheel spinning with all the available power. That's why the
Part Time postion is a better choice for when it is snowy. If it's
raining or icy with bare patches, keep it in Full Time. If your wife
is clueless, keep it in Full Time.

John Davies
Spokane WA USA

John Davies

On Sat, 6 Dec 2003 09:43:26 -0600, "Eric" <gymrat@***.net> wrote:

>I had assumed it was one of those systems that only engaged when the wheels
>slipped. Good news that I was wrong
>
>What is different about the full-time setting than the part time then? If
>they both engage the front axle...

In Full Time you have engaged the center differential in the transfer
case, which helps to eliminate front/ rear axle binding. You can still
feel it a little as the steering wheel twitches during sharp turns.

The center diff is _not_ a limited slip in the XJ, so you can still
get one wheel spinning with all the available power. That's why the
Part Time postion is a better choice for when it is snowy. If it's
raining or icy with bare patches, keep it in Full Time. If your wife
is clueless, keep it in Full Time.

John Davies
Spokane WA USA

John Davies

On Sat, 6 Dec 2003 09:43:26 -0600, "Eric" <gymrat@***.net> wrote:

>I had assumed it was one of those systems that only engaged when the wheels
>slipped. Good news that I was wrong
>
>What is different about the full-time setting than the part time then? If
>they both engage the front axle...

In Full Time you have engaged the center differential in the transfer
case, which helps to eliminate front/ rear axle binding. You can still
feel it a little as the steering wheel twitches during sharp turns.

The center diff is _not_ a limited slip in the XJ, so you can still
get one wheel spinning with all the available power. That's why the
Part Time postion is a better choice for when it is snowy. If it's
raining or icy with bare patches, keep it in Full Time. If your wife
is clueless, keep it in Full Time.

John Davies
Spokane WA USA

Eric

Is there a reason the same transfer case isn't used in the TJ? Sounds like
a good option to have to me.

I use part time whenever we take the XJ on the trails, and use it when the
weather is nasty (i.e. WAY too much snow). I try to avoid putting the TJ in
4wd unless the weather is nasty or I'm crawling over some rock. Even on the
trails I'll put it in and out of 4wd when I don't need it.

Eric
99 TJ
00 XJ
"John Davies" <johnedavies@comcast.net> wrote in message
news:abv3tv4qbc7lgt40sd2vavs22op19o95s6@4ax.com...
> On Sat, 6 Dec 2003 09:43:26 -0600, "Eric" <gymrat@***.net> wrote:
>
> >I had assumed it was one of those systems that only engaged when the
wheels
> >slipped. Good news that I was wrong
> >
> >What is different about the full-time setting than the part time then?
If
> >they both engage the front axle...
>
> In Full Time you have engaged the center differential in the transfer
> case, which helps to eliminate front/ rear axle binding. You can still
> feel it a little as the steering wheel twitches during sharp turns.
>
> The center diff is _not_ a limited slip in the XJ, so you can still
> get one wheel spinning with all the available power. That's why the
> Part Time postion is a better choice for when it is snowy. If it's
> raining or icy with bare patches, keep it in Full Time. If your wife
> is clueless, keep it in Full Time.
>
> John Davies
> Spokane WA USA

Eric

Is there a reason the same transfer case isn't used in the TJ? Sounds like
a good option to have to me.

I use part time whenever we take the XJ on the trails, and use it when the
weather is nasty (i.e. WAY too much snow). I try to avoid putting the TJ in
4wd unless the weather is nasty or I'm crawling over some rock. Even on the
trails I'll put it in and out of 4wd when I don't need it.

Eric
99 TJ
00 XJ
"John Davies" <johnedavies@comcast.net> wrote in message
news:abv3tv4qbc7lgt40sd2vavs22op19o95s6@4ax.com...
> On Sat, 6 Dec 2003 09:43:26 -0600, "Eric" <gymrat@***.net> wrote:
>
> >I had assumed it was one of those systems that only engaged when the
wheels
> >slipped. Good news that I was wrong
> >
> >What is different about the full-time setting than the part time then?
If
> >they both engage the front axle...
>
> In Full Time you have engaged the center differential in the transfer
> case, which helps to eliminate front/ rear axle binding. You can still
> feel it a little as the steering wheel twitches during sharp turns.
>
> The center diff is _not_ a limited slip in the XJ, so you can still
> get one wheel spinning with all the available power. That's why the
> Part Time postion is a better choice for when it is snowy. If it's
> raining or icy with bare patches, keep it in Full Time. If your wife
> is clueless, keep it in Full Time.
>
> John Davies
> Spokane WA USA

Eric

Is there a reason the same transfer case isn't used in the TJ? Sounds like
a good option to have to me.

I use part time whenever we take the XJ on the trails, and use it when the
weather is nasty (i.e. WAY too much snow). I try to avoid putting the TJ in
4wd unless the weather is nasty or I'm crawling over some rock. Even on the
trails I'll put it in and out of 4wd when I don't need it.

Eric
99 TJ
00 XJ
"John Davies" <johnedavies@comcast.net> wrote in message
news:abv3tv4qbc7lgt40sd2vavs22op19o95s6@4ax.com...
> On Sat, 6 Dec 2003 09:43:26 -0600, "Eric" <gymrat@***.net> wrote:
>
> >I had assumed it was one of those systems that only engaged when the
wheels
> >slipped. Good news that I was wrong
> >
> >What is different about the full-time setting than the part time then?
If
> >they both engage the front axle...
>
> In Full Time you have engaged the center differential in the transfer
> case, which helps to eliminate front/ rear axle binding. You can still
> feel it a little as the steering wheel twitches during sharp turns.
>
> The center diff is _not_ a limited slip in the XJ, so you can still
> get one wheel spinning with all the available power. That's why the
> Part Time postion is a better choice for when it is snowy. If it's
> raining or icy with bare patches, keep it in Full Time. If your wife
> is clueless, keep it in Full Time.
>
> John Davies
> Spokane WA USA

Matt Macchiarolo

It might be a somewhat longer Tcase, and that would shorten the rear driveshaft
which is already as short as it can be without causing problems in stock form.
That's a guess on my part....

In article <WMnAb.10480$LV1.9798@okepread05>, "Eric" <gymrat@***.net> writes:

>Is there a reason the same transfer case isn't used in the TJ? Sounds like
>a good option to have to me.
>
>I use part time whenever we take the XJ on the trails, and use it when the
>weather is nasty (i.e. WAY too much snow). I try to avoid putting the TJ in
>4wd unless the weather is nasty or I'm crawling over some rock. Even on the
>trails I'll put it in and out of 4wd when I don't need it.


* * *
Matt Macchiarolo
www.townpeddler.com
www.wolverine4wd.org
http://wolverine4wd.org/rigs/macchiarolo_ml.html