In Reply to: Problems in overdrive posted by Sari on February 01, 2001 at 08:26:41:
I had the same issue with my 85 535i automatic (hey, I LIKE the auto! :) It was my driveshaft u joint. I had the drive shaft, center support bearing and guibo replaced and she's as smooth as silk now. I'm not saying it is your drive shaft, but I would have it checked.
Also, I was getting vibrations at high speed 80+ mph.