Transfer Case ATF refill
 

OK...SO I know it sounds pretty straightforward but for a newbie I want to make sure I get the visual first.

Where is the drain hole and where is the fill plug?

What year is the truck???? the drain should be just below the fill....its either gonna be an allen wrench type plug or a 22mm plug (pretty sure on the 22mm size) depends on the year

Yeah it depends on the year. You will see 2 plugs, obviously the one on top is for fill.