There are (3) zerks on each driveshaft.
Make sure that you grease it with the driveline unloaded. THis means chock the wheels, set the parking brake, place the transmission in NEUTRAL. This allows the grease to penetrate even where the high pressure areas are.
You'll also need a "needle"...
U-joints first
Then check pinion bearings and slop
Then transfer case input and output bearings.
May need to put it all up on jack stands and use a stethoscope to listen to the bearings.