Did some searching, haven't come up with a definitive answer, just lots of conjecture. 2004 Excursion 4x4 with 5r110 and a electronic shift transfer case. What lube does it take? I understand I can't go wrong with the Ford XL-12 transfer case fluid, but what if I can't get that? I know my local dealer parts guy scratched his head when I asked about it. lol And what about a 2003 F-250 (6.0) with manual tranny and a manual shift transfer case? Does anyone have a definitive guide out there?