The auto trak fluid is for the auto trak transfer case which 2500HD trucks do
NOT have. You may have an auto transfer case, which is a different animal than the auto trak transfer case. The automatic has the push buttons for 4X4 use, instead of the floor mounted shifter. The auto trak has the push buttons with one of them labeled "auto". This automatically shifts into 4X4 when it "feels" the truck lose traction. Sound confusing ??? Good because my head hurts now...
On edit...About the fluids...The auto trak takes a special auto trak fluid, and the others Dexron III.
Edited by: BamaFan