I know the upper and lower ball joins have rubber boots that hold grease, just pump until they start to buldge. if you overfill they pop and will squirt grease out the sides. This isn't the end of the world but it will wear them out faster. These rubber boots will also dryrot eventually causing them to leak grease. Salt plays a big factor in this to for those of us in the cold climates. I know there is another fitting or 2 with a boot but I'm drawing a blank as to where it is. If there isn't a boot, just pump until you can see the grease coming out.
I personally use Lucus Red N Tacky, and I grease everytime I change the oil.
Brian, 911 Dispatcher, Volunteer FF/EMT.
2006 LBZ Duramax 2500HD CCSB, Allison 1000
"All on" Highbeam Mod
Banks Ram Air Intake
Some Emergency Lights and a Mobile VHF Radio