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What oils for very hot temps?

I'm going to be sending out F350 to Australia next
year. We'll be taking trips during the hotter parts
of the year, with temps >100F. The Canning Stock
Route involves crossing 900 sand dunes over 1100
miles. I'm a little worried about heat buildup in
general, especially in the low range planetary
gearset of the transfer case. I wish the transfer
case was an old gear drive cast iron piece. Anyway,
we're supposed to use Mercon type ATF in both trans
and TC. Replacement candidates include 75W-90
Arctic gear lube (viscosity of ATF at 100C.=7.1
cSt, AGL=14.6), 0W-30 synthetic arctic motor oil
"Sub-Zero Fluid" 10.5cSt. Any ideas about these
products or others? I'm planning on using 85W-140
in the diffs (31cSt) and maybe straight 40 in the
engine (70K miles). Right now I have to carry 4
different fluids as spares: hydraulic oil for the
winches (of course for hydraulics in a pinch
anything will do), ATF, gear oil and motor oil.
Charlie

• 4980. Re: What oils for very hot temps? , posted by JJ
  
•  4988. Re: What oils for very hot temps? , posted by Headhunter
  
•  4991. Re: What oils for very hot temps? , posted by ray
  
•  4990. Re: What oils for very hot temps? , posted by JJ
  
•  4994. Re: What oils for very hot temps? , posted by Headhunter
  

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