TD5 vibration at speed?

[Landyman]

My TD5 manual makes a noise between 60 and 70 mph a bit like being on rumble strips. I have replaced all the tyres had them all balanced, and replaced the rubber on the rear prop but none of this has made a difference. It does it when its in gear and in neutral. :-k
Any ideas please as I'm at a bit of a loss now apart from perhaps getting the prop balanced but I don't see how it could of got out of balance.
Do you think wheel bearings could do this? :doh:
Cheers for any help.

Paul..

[disco2 td5]

id be saying something to do with prop have you cheaked the ujs they maybe worn

[Landyman]

They look ok but I think I'll change them anyway. Don't know what else to try.

[disco2 td5]

Have a look at them see if any weights have been flicked off  cheack the ujs take the props off n move the ujs see if there's any play or tight spots in them