FJ denote the petrol 2F engine variant and BJ is the diesel 2H ,,,, 40 is the shorty of snowy river fame
I think a BJ47 is the Troopy. BJ-FJ 45 may be the ute /table top
https://en.wikipedia.org/wiki/Toyota_Land_Cruiser_(J40)
I did that same trip in '83 mind blowing imho.
We had a G60 3 speed work truck top speed 90kph.
A few guys took it to the Gulf again an epic journey 27 flat tyres [bar treads] at the time
that was just on the way up.....lol