Following on from my '06 GV ... Soft Roader??' Thread, I took my car in for a service today as I had an incident on the weekend where I drove through some water that was a little deeper than it looked and subsequently filled my air filter with water and stopped the engine.
I got it going again, and the engine worked itself out ... but since then a whine from the Driveline has developed above 60Km/h.
The Service guys found water in the diff and drained the front and rear and replaced the oil ...
Only problem is that the whine (or drone) is still there

It only occurs when travelling above 60 or 70Km/h and get's higher pitched and louder the faster you go.
It also is only present when the power is on ... take your foot off and the noise stops. Put it back on and the noise starts again.
It's not the engine ... is fine at any revs.
Not sure what could be causing it ... Can anyone help me out with this one??