VITO Vibration

[marine]

Im new to the forums so forgive me if this has been covered before.
I have a W639 Vito (2010) manual diesel with 140k on the clock.
Im getting vibration underneath the centre of the van at 20mph and 40mph
the vibration goes away when I press the clutch in or let my foot off the accelerator so i know its not an issue with the wheels. A local garage has told me it could be the prop shaft or the clutch but wouldnt commit to either.
If anyone has had any similar problems Id appreciate your thoughts on this.
Thanks in advance

 

[Marku]

The garage is probably right. Sounds like a joint on the prop shaft. Not a great problem you can do it yourself.

 

[marine]

I wouldn't know how to do it to be honest, but I appreciate your help.
Thanks very much