The driveshaft uses a very standard NGLI #2 grease (~$2 a tube at a discounter) and a standard grease gun with a flexible zerk head (the standard) is what you need. A moly-fortified EP gease is often recommended at the Slip Yoke to reduce thunk (my 98 FSM only says MP grease, meaning whatever you got) . The front u-joint is a real tight fit with most heads so you may need to search for something with a thin profile.
Any diff oil in 75w-90 will do. I haven't seen a fluid related failure on the board yet and I doubt we ever will if they get changed every now and then. Don't bother searching for a 80W-90.
Most dealerships are not servicing with a Toyota branded fluid but a major name bulk fluid that meets the spec'ed standard.
The driveshaft does not get overfilled. Under-serviced driveshafts get blocked seals and do not allow for proper flow of the grease around the seal
. Read my post #45 in the following thread for a good description of the situation.
http://forum.ih8mud.com/100-series-c...e-shaft-2.html