Also as MudRunner has suggested!
I just remembered that My auto hubs played up with me in Tassie in 2005 on my 1999 4.2 turbo diesel Patrol wagon. I had a prick of a grinding noise going from 40ks to 80ks. The circlip had come loose on my drivers side hub and failed to disengage causing damage to that hub. I then replaced my auto hubs with manual hubs!
PS, good call MudRunner!
Regards,
RLI