Absolutely empty? You need 4 quarts, fill it until it is just below the fill hole. If you can stick your finger in there, bend it and get oil on you finger you are good. It should be about 3.5 quarts total.
What transfercase?
The NP208 which would be stock for a 85 is about 4.5quarts, but again, fill till it comes it is a little below the fill hole..
If you are just draining it 3-4 on both.