The drive shafts connect the transfer case and differentials.
The transfer case,transfers power from the transmission to the front and rear differentials.
You'd be talking about the driveshafts...
transmission
The front and rear axles are differentials.
if 4x2 only 1 differential which is the pumpkin between your rear axle, if 4x4, there will be a transfer case at the front of the vehicle coming off of the transmission going to front drive shaft and front differential.
The driveshaft
Power goes from the engine through the transmission to the differential to the front or rear axles. If it is all wheel drive it has a transfer case or center diff. between the transmission and the differentials.
The service manual says.... The transfer case near left foot uses engine oil - GN4 4-Stroke Motor Oil. 10w40 or 10w30 The differential's uses Hypoid SAE #80
It could either be a problem with your 4x4 switch in the cab, the actuator that connects the front right axle shaft to the drivetrain, or the transfer case itself not sending power to the front driveshaft.
front and rear differentials that is if it is a 4x4
Open differential unless you ordered it from the factory.
The differentials uses 75W90 synthetic axle fluid.The differentials uses 75W90 synthetic axle fluid.