This is not a very critical fluid. The transfer case only uses the ATF as a lubricant and not a hydraulic fluid like in a AT. So any Matic D compatible ATF will work. Generally ATF comes in 2 flavors. Old school and light weight. Matic D is more of the old school variety. I forget if I used a redline or amsoil fluid in my TC. Swapped it in about 8 years ago (50K) and have had no issues.