Torsen differences

[QSHIPQ <QSHIPQ@aol.com>]

Dave E writes:
>different from that in the rs2 (based on the 6-speed box). 
>ur-q part: 016 409 751 a
>rs2 part:  01e 409 751
>noticable differences:
>rs2 has a large helical spring between the rear shaft and the rear side gear
>(presumably to provide side loading to this gear).  the unit has the same
>number of invex gears (3 x 2), but is noticably shorter than the 016 torsen. 
>the arrangement of shims/washers and bearings is also different between the
two
>units, with different part numbers as well.
>a torsen is a torsen is a torsen?  well, no.
Dave, 
This doesn't tell you much, are you sure you are looking at the Torsen, not
the front differential?  I have the same microfiches, and it lists the Torsen
as a component.  That component is NOT seviceable (per Audi) and costs about
1600USD.  The spring and shims listed are to locate the shaft and the torsen
IN the transmission, the bearings, some are the same, and are based on shaft
size and location, NOT operation.  You will find many similar parts in the
locker.  This has NOTHING to do with torsen OPERATION, only location.  Further
investigation shows the following applications:
*  01A 409 751D  90sq/cq
*  01A 409 751  100Q
*  01A 409 751D  100Q
*  01A 409 751A  200TQ
*  016 409 751A  V8

What does this mean?  Not sure anything.  My own thinking is that it is a
transmission difference only, and/or a chassis reference (in case they made
later changes).  However, the fact that your Urq part number is the same as
the v8, makes me think that the differences are NOT in BR, braking, helix
gears, shims, gears or wheelbase (my original suspicion).  

So, until we KNOW otherwise, let's KISS, and keep a torsen a torsen on the
audis.  The microfiche, audi, bentley or published documentation doesn't show
anything otherwise at this point in time.  Assuming it to be different based
on part number alone or by looking at the fiche picture, just doesn't let you
draw any conclusions.  

HTH

Scott Justusson
QSHIPQ@aol.com
No torsens, so no bites