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Re: Carrera 4

   From:	"Barton P. Chambers" <bchambers@atlantic.nos.noaa.gov>
   Date:	Tue, 11 Oct 1994 04:02:00 -0700

   High-end late model Quattros use Torsen (TORque SENsing) center
   differentials while earlier models use (lockable) mechanical differentials. 
   My Syncro is the Audi 4000 series quattro system (and I believe, the same
   as the Ur-Quattro and all other pre-torsen models).  The center and rear
   differentials can be manually locked by the driver, on the fly.  No
   clutches are used in either system, to the best of my (limited) knowledge.

This was the same scheme used in the Jeep Wagoneer "Quadra-Track"
system in the early/mid 70's, right down to the diff locking.  I think
that this was the first full-time (i.e. dry pavement) 4WD system.