That is 100% Dana 60 axles with some kind of either custom portal or maybe even the moggy or merc bolt on portals. Pretty common mod when you get to the 40" range.
I worked with a few Sydney boys when I was in hotrods and we did these for some of the early rigs running 44's coupled with hydro steer and eventually rear steer and then a custom drop down portal that was heads and shoulders above the moggy ones. The bloke who was building them was a mechanical fitter machinist engineer god but unfortunately he has since passed and is missed with heavy hearts at every event.
Without hijacking the thread you should all take a few minutes to watch his legacy machine if you haven't already seen it.
http://youtu.be/9Z4hD_u7ohI
http://youtu.be/GzXVLbs41Ew
I worked with a few Sydney boys when I was in hotrods and we did these for some of the early rigs running 44's coupled with hydro steer and eventually rear steer and then a custom drop down portal that was heads and shoulders above the moggy ones. The bloke who was building them was a mechanical fitter machinist engineer god but unfortunately he has since passed and is missed with heavy hearts at every event.
Without hijacking the thread you should all take a few minutes to watch his legacy machine if you haven't already seen it.
http://youtu.be/9Z4hD_u7ohI
http://youtu.be/GzXVLbs41Ew