Spadge - i havent driven mine for a while, but when I do I will let you know if i hear the noise after 100 mph.

I know when I first bought it, it did this and then changed wheels and problem seemed to have been solved.

Defo vibrated and noisey after 100mph.

The diff has not been changed since I have had the car as im currently waiting for it to give up the ghost but it just keeps on going