I have a 2005 gu zd30
am pretty sure the sound is coming from inside the steering box. Had the wife turning the wheel while I followed the noise and the only spot I could trace it back to was the steering box.

It's not a constant noise while going around a corner. I think it mainly happens when the car is under load.

I will be getting it looked at tomorrow as I am going away on a week holiday up to the NSW outback doing the darling river run up to Bourke for a week.

Will let you guys know what u find out.