Just had 3000km"peace of mind" service done on my new fg xr6 turbo ute and had small noise in driveline at about 90-100kph under power, so guess what I need a new diff. Can not complain about service from dealer but have to wait 2 weeks for new diff.I know it is all under warranty but not real good for new car.

That's common. Been going on since the BA was released (possibly earlier).

My old ute's first diff had a whine right at 100km/h. So annoying!

The replacement whined too, but it was at a speed that you're never cruising on so I was happy.

Just a bit disappointed I think it is my first ever brand new car,but will get over it.

I was the same mate. These cars are good bang for your buck, but they aren't designed for the specs.