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Team,
I currently have no issues with the front wheel hubs, that I'm aware of. Should I "proactively" replace the front hubs or should I wait until I notice signs of failure?
Aside from Timken and SKF, are there any economy brands you all recommend?
Unless there is vibration, humming, or significant play, leave them be. New replacement wheel bearings of all brands are universally inferior to the OE GM.
The rears there is maybe a marginal increase in the validity of a proactive replacement due to the increased labor... but even then, most of the time it is best to let them be.