964 C2 1992 Tiptronic Vibration under power

[simon.marsh@xtr]

I'm still trying to solve a couple of problems that may not be related.
Vibration under even modest acceleration. and also the gearbox.

I dont know how the tiptronic box works but its like the box doesnt engage immediately. Its like the revs reach a certain stage 1500+ and then the gear engages completely. Today even more strange I drove off from stopped and the fault light with a gear lever came on and the car would not change from second. The gear position light showed "D" but the gear selection light did not come on.
This may be totally unrelated to the vibration which has been suggested as coming from the engine mounts. I have checked wheels for balance etc.

There is a slight rear RHS wheel bearing noise on left turns.