Well, your question makes me think that you have not done this before so...you don't know the status of the fluids currently in the diff and final drive (when they were last changed) so...I'd change them instead of just topping them off!
Use SAE 80W or SAE 80-90W API GL-4 Hypoid gear lube. Since there is no "ye11ow metal" in these gears, you can use GL-5 rated oil. I use the Lucas synthetic.
Also, be aware that the "proper fluid level" for the rear drive unit is something of a nebulous thing and it's generally best to just drain and re-fill with the proper amount unless you have a leak you are trying to compensate for (which you should fix anyway).
If you would like, I can get a copy of the Yami Service manual for your quad but I would suggest getting the Clymer's manual as well...it's a great book.
As a side note contaminated oil or low level in the front diff will cause your 4wd indicator to stay on the dash even in 2wd.
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