Yes. Terminal.
I had the same. Bought a 100 auto H reg. Test drive was fine, driving back down the motorway was whining. Sounds like someone put some stuff in it to mask the noise, which has now returned......
More so when "under load".
The 100 auto box is a well known shite design. The seal between the auto fluid and the diff oil goes, and they mix, and it kills the torque converter.
Check the colour and level of your Auto Transmission Fluid. If it is low or brown, probably bad news.
Mine died within 200 miles.......
But try this:
http://audifans.net/modules.php?name...060&highlight=
My car here (now more bits missing)
http://www.classic-audi.co.uk/forum/...highlight=auto
This is the story about MY car (which Diamond Hell "borrowed" for a while).
http://www.classic-audi.co.uk/forum/...highlight=auto
sorry to be the bearer of bad news.........