It even changes gears more smoothly now?
So with transmissions and transfer cases they all are fairly similar as far as viscosity goes. It really isn't a fluid thing that needs to be researched, but the part itself. If there is a lot of copper or plastic or clutches, or something different in the t case then it would have special requirements. In order to see if the fluid is compatible you need to know the innards of the part, and then you need a uoa of the oem fluid, to really judge. In some cases the fluid wont match the service interval. For example, redline d6 may not have the calcium required for a 60k interval in a transmission that has plastic pieces, so redline would still work just as good, but to protect the transmision you may need to change the oil more often. By the way, that isn't a hypothetical issue, but something Dave from redline actually said about d6, I forget what application he was talking about. Usually redline is an extended service fluid, but not in every case, depends on the application.
I know sean from his ecodiesel opted for maxlife in his zf8 tranny, and he was on a 25k interval. Well there ya go, when you lower the interval you choose that will correct if something is lacking in the formulation. But in some cases using the wrong liquid can be fatal, especially transaxle fluids. It's not knowledge of oil that is needed, but knowledge of what is different about that t case. Then you can come up with a strategy. I just don't know anything about that t case except what Corey has said. I also don't know anything about that fluid, is there a spec sheet out there?