Help: 1988 4WD Suburban hubs

Hi,
The passenger front tire hub always has black oil/grease on it. The driver's side is dry. Any ideas?
tia

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If these are the automatic hubs, it should have a dress cover held on with screws. The flat rubber O-ring under the dress cover is probably leaking.
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snipped-for-privacy@webtv.net (Rich B) wrote in 3213.bay.webtv.net:

Thanks for the info
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