JJ... I think I understand your question alittle better now. There is no such thing as independent fourwheel drive that I know of. We are talking of Independent Front Suspension.
H2 has a fulltime 4 wheel drive meaning that it is always in 4 wheel drive, usually in 4 High Unlocked Mode, meaning that the differential inside the transfercase is unlocked. This will let the front and rear driveshafts turn at different speeds as the vehicle goes around corners and over uneven terrain. If the vehicle were on a slippery surface like ice and the transfercase was unlocked as soon as one wheel lost traction the truck would not move were it not for the Traction Control/ Anti Skid System and the brake computer, just like when one wheel on a 2WD without posi traction looses traction. When the transfercase differential is locked in 4 High Lock or 4 Low Lock both driveshafts have to turn at the same speed as they are locked together inside the transfercase.
The transfercase can be seen in this picture behind the transmission (pretty big isn't it). BTW the thing on the frame rail with all the lines is the control for Anti Skid/ Trac Control.
Hope I made this explanation clear.
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