"You will find that filling the transfer case with new fluid is a real PITA. There simply isn't very much vertical headroom between the fill port and the bottom of the Durango body. "
To fill my Dakota I used an empty plastic gear oil bottle that's round and has a pointed spout.I fitted the spout with some clear plastic tubing and was able to squeeze in the tranny fliud while holding the bottle higher than the fill hole.