yup, but it's pretty damn close, so close it could be labeled awd
We have a front diff, a rear diff which operate the same no matter what.
We also have something very similar to clutched center diff.
In auto4 the systems changes the front and rear torque split through the clutch. There is NOTHING that is locked or binding, all 4 tires can spin independently of each other. This is almost exactly how an awd system works.
In 4wd hi, the front and rear axles are locked
Ok, sort of right.
In Auto the clutches in the transfer case engage at 10%. As soon as one of the ABS sensors on the rear wheels detect slippage the transfer case locks fully and then is in 4wd. if the truck has the G80 locker in the rear then both of the rear tires are locked until speeds hit 20mph and the locked opens up. The front diff is a open diff, so both tires get equal power until one of the tires slips, then power moves over to that tire due to how open diffs work.
While in Auto the transfer case stays locked until the slippage event decays out, then it goes back to 10% loading until another event is detected. GM promotes the G80 locker as being able to deliver equal power to the rear wheels even if one is slipping instead of having open diffs on both ends.