Congrats Michael - did that extra 2 1/4HP in the back on the way home make a big difference... :D
Oils are all different yes, transfer case uses a special synthetic as do the diffs which use a different oil to the TC - I'm sure there's an equivalent oil somewhere but for the litre each one takes, I found it wasn't a hugely expensive excersize buying genuine from a dealer.
Same as the coolant - 5 litres of concentrate from the dealer makes up the 15 litres of coolant required if you change it - 10 litres of deminerilsed water is cheap, and the concentrate was around $80 IIRC.
I used ordinarily PS fluid when I change mine way back when I got it and it hasn't been done since and it never had any issues with the 100,000KM we put on it.
An oil change takes nearly 10 litres, so buying it in 20 litre containers will save you a heap. I could buy 20 litres of what I used for about the same as 2 x 5 litre packs down at Supercheap.
Once you're happy with all the fluids, the only other maintenance item I'd be checking sooner rather than later is the centre bearing and uni joint in the rear tailshaft - these look like they are starting to become a problem in the earlier models. Not a hugely expensive fix if your handy with the spanners, but as the old uni is staked in, a press certainly makes life easier here.
Oh, if you don't have a set already, you're going to need a good set of torx bits and torx sockets - pretty much everything on them is fastened with torx screws.
