The transfercase has 2 plugs in it, the top one is the fill, just take it out and fill with DexIII or 6 until it trickles out of the hole, if you want to change the fluid just pull both when it stops coming out of the bottom put it back in and refill the same way I said before.
When I said to keep grease in the balljoint I was talking about the grease zerks on the indivijual parts. Grease zerks are the nipples, for lack of a better word, and you just pump grease into them with a grease gun. I put a pick of a tierod below, the zerk is the silver part.
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*EDIT* Also the grease gun will click/pop onto the zerk, sometimes the grease wont go into the zerk, in that case I just pivot the grease gun around on the zerk while pumping slowly until you find the sweet spot where it will go in.
Sorry if my comment makes me look like an ass or I'm underminding you but I try to explain myself so that if you had no idea you would understand.