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"pulling" trunk codes

In message <000201bd46b9$62419080$9e29d7c2@joukoh.vtoy.fi> "Jouko Haapanen" writes:

> To the best of my knowledge, there are no limited-slip diffs in the
> traditional sense in any quattros.

Take a look at the ur-quattro parts microfiche, where it describes the ALZ.
All of the frames are quite clearly labelled "Limited Slip Differential", 
although I agree with you completely that what is pictured is _NOT_ what I 
normally understand by this term.
Unfortunately, I've only got the drive train microfiche (016 gearbox) from 1987 
- the year before the TORSEN and ALZ started shipping.  I've no service 
documentation for the ALZ - if you have some, could you give me the Audi 
publication number for the microfiche?
I'd like to know how the ALZ works (and what justifies the 'limited slip' 
description in the microfiche) and, knowing how it works, I'd like to know what 
other Audis have similar rear differentials.
It looks to me like the ALZ is fitted with a simple detent (and before anyone 
gets silly - this is in ADDITION to the standard externally operated lock).  If 
this is the case, the rear differential would lock HARD if the left and right 
rear wheels developed a sufficient rpm delta.  No slip, no slide - BANG! and 
it's locked.  And if that's how it locks - how does it unlock?

 Phil Payne
 UK Audi [ur-]quattro Owners Club