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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.
 

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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.
 
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