[68panelman]

Since we are all being comedians and not assuming a plugged vent port, maybe OP has no hose, mud packed, whatever. My turn... before wasting time jacking up front axle, spin the shaft by hands like I said, to see if transfer case is catching, then to test hubs, put transfer case in neutral and then spin the drive shaft again, that will tell you if it's hubs or transfer case. No jacking required. Back to my corner