I hate to say it, but I had exactly the same problem when my transmission went bad ... vibration disappeared when I replaced the transmission ... but honestly I did not try the revving after I changed they tranny ..

I assume the vibration starts over 40km/hr when you are on the second gear and you start to accelrate slowly... right?

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BMW 1M 2012 - Current
Jeep Grand Cherokee Limited 2011 - Current
BMW E93 330i Convertible 2009 - Sold
BMW E46 320i 2004 - Sold
BMW X5 4.4i 2002 - Sold
VW Golf GTI 2000 - Sold
BMW 740i 1996 - Sold