I read up on it and tons say Merc V is ok for TC. Alot use Merc V, royal purple,amsoil, mobil 1 syn trans fluid in TC, Merc V is just syn trans fluid in a 4x4 TC. (mine 4x4 not AWD)
https://www.explorerforum.com/forums/showthread.php?t=138659&highlight=transfer+case+fluid
Fo
For upper...