TRACTION CONTROL

[Raymond C Drouillard]

You are correct.  The classic Borg-Warner Quadratrack (TM) transfer case
used a preloaded clutch similar to what is used in positraction
differentials.

The "Quadratrack" name is copyrighted by Jeep and is used for any
full-time 4WD system that has no 2WD mode.  If there is a 2WD mode along
with the full time (able to be used on dry pavement) 4WD mode, Jeep calls
it "Select Track.  I have a Select-Track system that uses an NP229
transfer case.

In the past several years, Jeep has used a few Quadratrack cases,
including the NP219, which is, I believe, viscous coupled.

Their newest innovation is a gearoter system that senses a speed
difference between the driveshafts (or axles) and hydraulically actuates
a clutch.  They call this new invention "Quadratrack II"

By the way, Borg-Warner made the origional Quadratrack transfer case, but
not the newer ones.

Ray Drouillard
1989 Jeep Grand Wagoneer
(Viscous coupled Select-Track, Holley Pro-Jection EFI)


On Thu, 12 Nov 1998 08:41:44 EST ECMnut at aol.com writes:
>The early quadratracs were like a posi-clutch-pack inside a X-fer case.
>More recently (V8 Cherokee), they appear to use a viscous coupling,
>ver similar to AWD Astro-Syphoon units.  All of the above made for
>OEMs by BorgWarner.
>MV
>
>> 
>>  Jeep mechanically does something similar in the transfer case and in
each
>>  differential with its Quadratrack II (tm) system.  Instead of
stopping
>>  one of the wheels, it employs a cluch between the axles (in the 
>axle) or
>>  between the driveshafts (in the transfer case).  When a difference in
>>  speed is detected, the cluch is engaged, limiting the slip or locking
the
>>  axle or transfer case.
>

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