Volvo: volvo s80, volvo s80, noice

Question
There is a noice like something is loose when I accelerate hard. I feel like it is coming under the gear box. I can feel the vibration. First I thought it must be something in the boot but now I know definitly something under the car. Can you Help?

Answer
nandana,
A vibration indicates wear in something. Motor mounts, trans mount, bad axle. Someone needs to drive the car and feel the vibration and hear the noise, then get the car in the air to inspect these things. Since the vibration and noise are real noticeable that should be easy to find.