Dana 300 transfer case

[2wheelintim]

I'm changing out my transfer case on my 1985 cj7 it's a Dana 300. I got a used one from a 1980cj7 with the same transfer case but changing the fluid out. No one can tell me what kind to use and a good brand. Anyone know of any. Thanks

 

[69jeepcj]

80|90 gear oil, I don't have a specific brand.