Sorry guys your off by alittle bit. There is no viscous coupling in the H2. Pull the front drive shaft and you will have to go to 4lock to get the truck to move. It won't move in 4high open because there is a differential in the transfercase and it is normaly unlocked until you go to 4lock(either high or low). The power flow will simply take the path of least resistance. You can prove this by jacking one wheel up with a trolley jack in 4high open and lightly step on the brake enough to light the stop lights(this will deactivate the trac control) then try to drive off. It won't move until you let off the brake and trac control senses the spinning wheel (or wheels) and applies the brake to the spinning wheel(s) to add enough resistance to send power to the wheel(s) that still have traction.
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