RRE recommends BG Syncroshift (the regular one/non-synthetic) in the tranny and Red Line's Heavyweight Shock Proof Gear Lube in the transfer case. I've been using both for over 30K and never had a problem.
http://www.machevo.com/bgsynchroshift.html
http://www.roadraceengineering.com/eclfluids.htm
When you do the clutch, throw in a stainless steel clutch line and remove the fluid restrictor in the slave cylinder.
