Am I surprised? No, the dealer can never find the "noise" that you hear. I think they are all deaf.
Anyways, maybe someone here has had the same problem. When the car starts rolling, either in first or even backwards in neutral i hear a "ggrrrrtt" sound that lasts about 1 second and is only heard at a specific speed (approx. 5 mph). I thought is was the clutch, so that is when I tried to let the car roll backwards down my hill in neutral with the clutch out. It still made the noise. The car is not turning, so I don't think the steering has anything to do with it.
Anyone have any ideas.
Not clutch judder, either.