Curious tranny

[Boost]

Hi there Audi aficionados,

On an 86 5000s with auto tranny, I'm getting a fluttering type noise that is magnified just before the tranny autoshifts.  I hear this sound lasting predominantly before 3000rpm. At higher rpm's, not pronounced/even there.  I've tried to manual shift from 1 to 2 to D and this pattern is consistent.  Fluid is not discolored and remains at right level and no leaks visible.  BTW reverse engagement is smooth and uneventful (unless I hit a tree or something).

What's der meaning of deeze symptoms??  Also odometer has stopped working even though speedo is working.

Thanks all.  

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