we are talking about the R380 'box here, aren't we ?
If so, L/R used to use Auto Tranny fluid (Dexron II), but this was superceded by a specific manual trans fluid blended by Caltex/Texaco called 'Land Rover MTF 94' (catchy name, eh)
This works out as a 75w80 GL4 gear oil.
It works much better, hot or cold than an ATF or engine oil, with much better synchro performance, and hence better gear shifting. There are a number of equivalent oils now.
Here's a good site with a list of them and their specs.
http://members.shaw.ca/jbarge/MTF.htm. Of these I use Castrol Syntrans, a full synthetic, as it's readily available.
Another one that a number of people use with good success is Penrites Manual gear oil Xtra light
http://www.penrite.com.au/nextpage.php?navlink=db/productview.php&id=44&PHPSESSID=b3fca48844674d477b40975c1565698b.
With regards the transfer case and diffs, any old diff/gear oil works, either 75w/90, 80w/90 or straight 90 EP. I tend to use 75w/90 LS diff oil so I don't have to buy different oils between our Patrol and Defender.
Just don't ask if you should use grease or oil in the swivel pin housings. Trust me on this one, don't go there
Hope that helps.
Rick.
