Hi Kurt,
I think it'll be a very scary system, once it reaches the age when
things go wrong:
http://www.imajeep.com/2001%20Grand/...ive_system.htm
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

"Kurt R. Todoroff" wrote:
>
> My mother just traded her 1999 Grand Cherokee Laredo for a 2003 (4?)Grand
> Cherokee Freedom. The center console has a plate under the transfer case lever
> that says "Quadra-Trac II". I thought that Quadra-Drive replaced Quadra-Trac.
>
> I visited the Jeep web site and did a search on Quadra-Trac and Quadra-Drive.
> The search returned information on Quadra-Trac but nothing on Quadra-Drive.
> When I clicked on 4WD systems, the site provided information on Quadra-Drive
> but nothing on Quadra-Trac.
>
> Can someone help me to understand this?
>
> Kurt Todoroff
> sharkone@aol.com
>
> Markets, not mandates or mob rule.
> Consent, not compulsion.
>
> Remove "DELETEME" from my address to reply

 

We were talking about a woman who traded in a 1999 GC for a 2003 or 2004.
My guess is that the new car will be traded in long before these types of
problems show up. ...Unless of course the Quadra-Trac II is a new
development for this model year, in which case all bets are off.

Earle

"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:3F2086EE.A5FE4971@***.net...
> Hi Larry,
> I'm guess around a hundred thousand miles, is when many computer
> problems begin to show up, seeing it's combined with traction control.
> How old is your home computer?
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Larry Greenwood wrote:
> >
> > And what age would that be?
> >
> > Larry

 

Most of the computers I work with have had a long life. I have a radio
shack model 100 laptop and an okidata printer that are of 1983-4 vintage.
Both still working fine. Maybe the difference is the extreme conditions
the auto components are subjected to.

Either way, you are right about the cost of replacement parts. And for
whatever reason, electronic parts for autos seem to be priced far beyond
what it must cost to produce them in the first place.

I am hoping that the 7 yr, 100,000 mile extended warranty I purchased will
afford some protection at least up to 100,000 miles.

Larry


"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:3F2086EE.A5FE4971@***.net...
> Hi Larry,
> I'm guess around a hundred thousand miles, is when many computer
> problems begin to show up, seeing it's combined with traction control.
> How old is your home computer?
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Larry Greenwood wrote:
> >
> > And what age would that be?
> >
> > Larry

 

"MK Randall" <mrandall@mmm.com> wrote in message
news:bfrddu$p56$1@tuvok3.mmm.com...
> "L.W. (ßill) ------ III" <----------@***.net> wrote in message
> news:3F2086EE.A5FE4971@***.net...
> > Hi Larry,
> > I'm guess around a hundred thousand miles, is when many
> > computer problems begin to show up
>
> The system is mechanical, according to the link you posted...
>
>
The link is to a description of Quadra Drive, and according to the original
post in this thread, the new GCs use something called "Quadra Trac II."

Earle

 

"Earle Horton" <enfermero_diabolico@registerednurses.com> wrote in message
news:bfrf6b$hlus9$1@ID-147790.news.uni-berlin.de...
> "MK Randall" <mrandall@mmm.com> wrote in message
> news:bfrddu$p56$1@tuvok3.mmm.com...
> > "L.W. (ßill) ------ III" <----------@***.net> wrote in message
> > news:3F2086EE.A5FE4971@***.net...
> > > Hi Larry,
> > > I'm guess around a hundred thousand miles, is when many
> > > computer problems begin to show up
> >
> > The system is mechanical, according to the link you posted...
> >
> >
> The link is to a description of Quadra Drive, and according to the
original
> post in this thread, the new GCs use something called "Quadra Trac II."

In Andy's first reply to the original post, and at the later posted link it
was explained that

"Quadra Drive is the latest system which uses the same transfer case as
QuadraTrac II and adds limited slip/locking gerorotor differentials front
and rear, and is quite a capable system."

 

I was not under the impression that either transfer case had a gerotor, like
the link in Bill's post said. I was assuming that the Cherokee Full-time
system, the Grand Cherokee Quadratrac II, and Quadra-Drive were all using
the NVG242 transfer case.

Please correct me if I'm wrong!

-Andy W


"Earle Horton" <enfermero_diabolico@registerednurses.com> wrote in message
news:bfrinn$i97hi$1@ID-147790.news.uni-berlin.de...
> "MK Randall" <mrandall@mmm.com> wrote in message
> news:bfrgi6$a8o$1@tuvok3.mmm.com...
> >
> > "Earle Horton" <enfermero_diabolico@registerednurses.com> wrote in
message
> > news:bfrf6b$hlus9$1@ID-147790.news.uni-berlin.de...
> > > "MK Randall" <mrandall@mmm.com> wrote in message
> > > news:bfrddu$p56$1@tuvok3.mmm.com...
> > > > "L.W. (ßill) ------ III" <----------@***.net> wrote in message
> > > > news:3F2086EE.A5FE4971@***.net...
> > > > > Hi Larry,
> > > > > I'm guess around a hundred thousand miles, is when many
> > > > > computer problems begin to show up
> > > >
> > > > The system is mechanical, according to the link you posted...
> > > >
> > > >
> > > The link is to a description of Quadra Drive, and according to the
> > original
> > > post in this thread, the new GCs use something called "Quadra Trac
II."
> >
> > In Andy's first reply to the original post, and at the later posted link
> it
> > was explained that
> >
> > "Quadra Drive is the latest system which uses the same transfer case as
> > QuadraTrac II and adds limited slip/locking gerorotor differentials
front
> > and rear, and is quite a capable system."
> >
> >
> So Quadra Trac II is just a gerotor in the transfer case, and Quadra Drive
> adds gerotors in the axles. No computers anywhere then? From what I can
> see in the link, the "gerotor" (not a real word) is some kind of
> hydraulically controlled clutch, or maybe a limited slip with a fancy
name.
> My guess is that the disks wear out at 100,000 miles...
>
> Earle
>
>

 

I don't think so either. Once you are locked up, the "gerotor" (not a real
word) will sense no speed difference and unlock. On the other hand, most of
the GC's target customers don't need a full locker effect. "Rubicon Grand
Cherokee," no it just doesn't fit....

Earle

"Andy W" <ahwathome@hot.mail.com> wrote in message
news:bfrl3u$47t$1@web.onecall.net...
> The "gerotor" has two parts one connected to each axle shaft. One act
like
> an impeller, the other like a housing. If either axle shaft spins faster
> than the other, the impeller turns inside the housing creating pressure
that
> operates the discs in the limited slip differential.
>
> I don't know if a full "locker" effect can be created in this type of axle
> or not. I doubt it.
>
> -Andy W
>
> "Earle Horton" <enfermero_diabolico@registerednurses.com> wrote in message
> news:bfrinn$i97hi$1@ID-147790.news.uni-berlin.de...
>
> > From what I can
> > see in the link, the "gerotor" (not a real word) is some kind of
> > hydraulically controlled clutch, or maybe a limited slip with a fancy
> name.
> > My guess is that the disks wear out at 100,000 miles...
> >
> > Earle
> >
> >
>
>

 

I did a web search for gerotor and came up with:

http://www.hawkprecision.com/C/C05/C05.html

Looks like the innards of an oil pump to me. I don't quite understand how
this type of device is helpful in a traction control application. Doesn't it
basically function as a gear reduction?



"Earle Horton" <enfermero_diabolico@registerednurses.com> wrote in message
news:bfrmgj$i0d24$2@ID-147790.news.uni-berlin.de...
> I don't think so either. Once you are locked up, the "gerotor" (not a
real
> word) will sense no speed difference and unlock. On the other hand, most
of
> the GC's target customers don't need a full locker effect. "Rubicon Grand
> Cherokee," no it just doesn't fit....
>
> Earle
>
> "Andy W" <ahwathome@hot.mail.com> wrote in message
> news:bfrl3u$47t$1@web.onecall.net...
> > The "gerotor" has two parts one connected to each axle shaft. One act
> like
> > an impeller, the other like a housing. If either axle shaft spins
faster
> > than the other, the impeller turns inside the housing creating pressure
> that
> > operates the discs in the limited slip differential.
> >
> > I don't know if a full "locker" effect can be created in this type of
axle
> > or not. I doubt it.
> >
> > -Andy W
> >
> > "Earle Horton" <enfermero_diabolico@registerednurses.com> wrote in
message
> > news:bfrinn$i97hi$1@ID-147790.news.uni-berlin.de...
> >
> > > From what I can
> > > see in the link, the "gerotor" (not a real word) is some kind of
> > > hydraulically controlled clutch, or maybe a limited slip with a fancy
> > name.
> > > My guess is that the disks wear out at 100,000 miles...
> > >
> > > Earle
> > >
> > >
> >
> >
>
>