Transfer Case Fluid Change?

Just changed the fluids in the front and rear diff's in my 2004 EXT. Can't seem to find the amount and type of fluid for the transfer case. I was wondering if these units have the "Blue" fluid in them....i.e. very extended drain intervals.

My '02 Silverado 2500 HD has a tag on it that says any Dexron 3 auto tranny fluid is O.K.

Just wondering if anyone has specific knowledge on this topic.

Wayne

P.S.

Changing the diff's was easy.....Glad I did it...the truck has 4,300 miles on it and the fluid was very cloudy.

It calls for 2 quarts of GM Auto-Trak II (the "Blue" fluid) and is only available from the dealer--no one else I trusted recommended anything else.