Started having a vibration this morning. Crawled under and seen the driveshaft is vibrating. It only does this while the it is in out of gear. If you step on the clutch, brake or apply the emergency brake it stops.

Has anybody had this problem before and if so, what did they do to fix this?

 

check the u-joints, tail shaft and pinion shaft

 

Also check for wear on your center bearing.