By all means change out the bearings and seals if you suspect failure. It is cheap insurance. Before you drain the oil, lift and support the rear so the tires clear. have an assistant turn the tires while you place your hand on the caliper. If you feel a roughness that is sign of a failing bearing.

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Parts are on the way; should be here Monday. Hopefully if the weather cooperates I can attempt this Wed.---DirtySCREW