This should help:
http://mywpages.comcast.net/xterra/tech/Diff_fluid_change.txt Mobil 1 or any other synthetic is good for the diffs. I used Mobil 1 ATF for the transfer case too (note the warning in my how-to regarding the t-case)
Use a GL4 oil only for the tranny, NOT GL5. Hard to find. Apparently Redline MTL is OK though.
I used Castrol LMA when I flushed my brake fluid last week. Supposedly one of the best non-synthetic fluids around. I've heard bad things about Valvoline Synpower fluid as I recall. Start with the LR, then RR, the RF, then LF.
Coolant: Good ol' Prestone will do. Don't mix the long-life (like Dex-Cool) with the conventional type though. I'm not even sure if our engine is tolerant of the long-life coolants anyway, there are some issues to be aware of for it.
Brent