Steve...
According to what I have read on trac control it should have enough power to pull a 10% grade with only one wheel, but I don't know if that is with or without the aid of the locker. I feel your assumption that only the front axle would be in trac control mode, if the transfercase and rear axle were locked, is correct, but sometimes GM does some really weird stuff with their computer controls and they seem to go against comon sense until you read the theory of operation in the shop manual ( but we have no shop manuals yet).
Whenever we are able to get a locker for the front axle we will truly have All Wheel Drive.
Now think about this for awhile and let me know your thoughts: Do you want to tie the front axle control in with the rear axle control or do you want to keep the controls seperate. With the controls seperate you could select rear, front or both, but tying them togather would probably simplify the installation wiring somewhat.
Don
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