Your rear axle looks just like my 84 axle. I have the H41 four speed and transfer. It has the hand brake. The split transfer cases I in Australia are all 10/82+ (start of the 83 model year). That was the date the fifth gear oiler provision. 83/84 had a hand brake in Australia. If there was one it wouldn't have a handle to operate one. My money is on transfer was replaced with one from another series or from FJ40/BJ42. Mid wheel 40 series was not sold in Australia during the eighties. Never seen one there older than the early sixties.