Annoying high pitched whirring noise

[Mezza]

Coming from the passenger side it sounds like, sounds kind of like a supercharger whine or even a fan that gets louder and quietens based on rpms going up and down. Can't hear it with the top down and it does not go away when the clutch is engaged.

[aozora]

When did it start happening? Does it happen with the stereo off? If you clutch in and roll at a decent speed, does it still happen? Tapping the brakes make it go away temporarily? Could be a number of things really without more info...

[Mezza]

It started happening about 4 months ago, I've had the car for almost 6.
Yes.
Yes.
No.

I reckon it's the diff, when decelerating (let off the throttle in 2nd for example) you can hear a clunk from the rear sometimes.
The diff had been reconditioned just before I bought the car, but I am getting it inspected thoroughly next week just to be sure.

[aozora]

Yeah just as you mentioned, it sounds like the diff. Especially if the tolerances on the rebuild aren't spot on...
Is it just a standard 4.1 Final Drive or higher?

See what the inspection turns up :)

[Hasbeen]

You've been taking your girlfriend out in the car again, haven't you?