don't know if it driving too hard as the noise can't be heard when driving at speed the other road noises drown it out. it is not rev related only speed. if i select and stay in 2nd the noise occurs at about 20mph the same as any gear. it only occurs when the wheels are moving. wheel bearings sound okay. have tried switching off air con., moving wing mirrors, bad panel joins just can't locate the source. need a rolling road at least that would tell me if its wind causing the noise. its cost me £700 so far and still no closer to curing it.