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Assuming everything is still stock you are correct in assuming that if the front driveshaft is spinning at all it should be making the vehicle move. There is no axle disconnects or anything of the sort found stock in the AWD Grand.
What modes does this model have? Just AWD and lo-lock? Is the case a NV249?
Pretty sure it has a fixed rear output, meaning there is a direct connection between the engine and rear axle, and the viscous coupling only supplies variable torque to the front axle. At least I know the NV247's used in the '99-later WJ were set up like this (only had AWD, Neutral, and 4 low lock). You could pull the front shaft and still get 100% power to the rear axle, but couldn't pull the rear shaft and drive on the front unless you locked it in.
They also used the NV242 on some models, and it had 2hi, 4hi, 4 hi lock, N, and 4 low lock. However it was just an open diff in the t-case.
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