Grease/Zerk fittings

My guess is that all grease fittings are sealed. To be sure, I'd stop into the service dept of my GMC dealership and ask to see the grease chart.

I'm pretty sure its all sealed up....didnt see anything about it in the service manual.

Sealed bearings have been pretty much the norm on most vehicles since the late 80's early 90's. To me that's a good thing, since being sealed doesn't allow air and dirt to get in the bearing over time...and they seem to last longer than the old bearings with grease fittings.