Another vibration !!

The car has started to vibrate when the engine goes over 3000revs. Petrol 4.0
Engine is smooth no misfire and has had a cam shaft and front rebuild. It did this before the rebuild and does it when it's stationary and driving. Any ideas. Drive train is out the equation unless it's gearbox mounts. I have searched this and a few of the same questions have come up bur no answers

does it make any unusual sounds when you turn it off?
or if you jump on or off the gas?

No unusual noises