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Where can I find a rear wheel bearing for a1988 GMC truck .?

can’t find one at part store

u need to try a real parts store like carquest. make sure u get the GVW (gross vehicle weight) its located on the drivers door pilar. Any carquest should have them in stock. another thing if the axles are grooved or damaged they make repair bearings with the seals made onto them.

Independent Trucks Bearing Test w/ Skating