In my experience, I've seen as many "dry" bearings as "wet" bearings that fail. Often, with bearing failure there's no grease visible and the front of the hub will actually appear dry and white while the rest of the hubs appear darker, somewhat less "dry" (but not wet) if that makes any visual sense to you.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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