Got the diff cleaned up and painted and back in the chassis.
Added an AN#6 fitting for the vent to connect to.
Adapting the Commodore diff to the Ford sourced rear end wasn't that difficult. It turns out the BTR80 and BTR75 both have the same bolt pattern for the back cover. It was just a matter of swapping over the back covers to take care of the rear mounts. The front mount required some fabrication as its a completely different design to the ford.
Cheers