It's got a hollow sounding knock from passenger side when putting load on and off and makes a sort of throaty roar when vibrating
 
I've had it in 2 garages and both say mountings look fine but there's still a sort of hollow knock coming from passenger wheel area when putting load on and off ie changing gear
 
Ok so I have just decided to put the rear prop back on to see if it would help pinpoint the vibration but when I tried to drive it it felt like it didn't want to move and the gearbox felt like it was vibrating with resistance so I've took the prop back off
 

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