Apologies. I had previosuly looked into the resonance issue previously because it was present on two cars I test drove. I didn't quite read your post correctly and jumped the gun.

One of the TDI's that I drove that was trying to hold 6th gear uphill at low speed which resulted in a fair amount of driveline 'shunt'. I mentioned this to the dealer at the time and they said that this car was scheduled for a DSG software 'upgrade'.

Geoff