Are you asking about the transfer case or the manual tranny?

If the MT, then it's pretty hard finding GL4 oil and GL5 is NOT repeat NOT an appropriate substitute. A long time ago, I found some Coastal 75W90 GL4 at Advance Auto but then I gave up and just switched to Royal Purple synth. Maxgear, I think it was called. Ordered from Courtesy Nissan at the time.