I have had great luck with the merchant automotive transfer case fluid. 2 quarts and your good to go.
2004 GMC Sierra Crew Cab Short Box, stock LLY Katzskin leather, westin platinum steps, Extang tonneau cover, 265/75 16 Michelins. Kenwood DNX772BH with GPS navigation, Sirius XM radio with Kenwood backup camera. Compustar remote start system. Line-x bed liner and coolant system filter.