This sounds like a fairly simple case of the engine setting up a harmonic vibration through the car. It’s not an uncommon thing and diesels are worse than petrol engines purely because they vibrate ...

Note: The dimensions shown above are for the Holden 5 LS (fwd), 2.4L, Unleaded Petrol, 6 SPEED AUTOMATIC. To display dimensions about another variant, click on one of the rows in the table below. 5 LS ...