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Dex VI would have been the quoted spec for all years but it was not yet certified for the transfer case when the 06s were released. The electronic service manuals that GM uses will specify Dex VI for all years of the H3. Unfortunately, they can't electronically update printed materials like the owner's manual. :giggle:Lol... the T-case fluid can of worms...
The most likely reason for them to transition from speccing the Dex III to the Dex VI is the reduced viscosity of Dex VI is apt to improve average fleet fuel economy estimates.
I think the best maintenance that you can do to the transfer case is change the fluid often. Unlike the diffs or the transmission, there's no magnet to catch any metal particles so those pieces keep floating through the oil. They may be small, but they will be abrasive nonetheless. I did a fluid change before Moab and post Moab, about 3000 miles on the oil and there was a light silvery sheen. Looks like something is wearing out in there. I've also gone 20K between changes with less metal apparent in the fluid.