I've got a 2001 Ford Focus 1.6 with just over 30K miles on the clock. At
70mph - 75mph i'm getting a very loud droning noise which appears to be
comming from the front of the car. If i'm 1mph either above or below this
speed the noise disapears. Also on this certain road i'm getting a slow
vibration comming through the car, almost like something is resonating
against the floor pan. This seems to appear at any speed but only in this
one road. I think it's to do with it having slight dipps in the road.

The car only went in for service last week so everything has been checked
(although i didn't tell them about the problem). I've also jacked the car up
to see if there is any play in the wheel bearings, but they appear to be
fine.

The noise is still there if i put the clutch in, so i assume it can't be the
gearbox? As such i'm starting to think that it's the driveshaft, but of
course this was checked in the service. I have to take the car back to the
dealer next week as my power steering pump is leaking, but i'd like to know
if anyone has any ideas what it could be before that. I can imagine them
replacing loads of parts and still not solving the problem.

Thanks.