Hi guys, I have a FG F6 auto and it has suddenly developed this vibration under hard load in any gear, not just on take off, even crusing at 80kph and you load it up you can feel it. Under light acceleration there is no sign just under hard load. Car has a built heavy duty 1200hp tailshaft, most bushes in rear are near new or upgraded, car is making 450+ rwkw. I'm new to the ford game so hoping someone can help, I'm thinking either engine mounts? Centre bearing? Thanks