a833 OD vibration in 4th gear at 3000 rpm

I had to schedule an appointment for this Mr.Driveshaft fellow up this way.
Monday I shall hopefully know the problem and have it corrected.(hoping it's the driveshaft that is) he said it can also be a joint, etc..
Time will tell.
Thanks to all for all the replies, at least I didn't look that stupid when I went into the shop talking "what may be the problem" lol
Maps