final drive: CASTROL SAF-XO get it from opie oils in redruth ( they do mail order) drain then refill using 220ml of oil. do not use the drain hole as a guide!
drive shaft: use honda moly 60 on the splines.
gearbox: same as final drive - fill until it runs out of the fill hole.
lots of posts about the FD oil change - many with pics also, do a search.