I have a 1998 Silverado GM 8.5 Differential. Leak is on the passenger rear side. I replaced the oil seal twice, name brand and GM brand both failed. I emery cloth and buffed the bearing and seal area. Ran a wire through the vent hose and I could hare it fitting the differential gear. I suspect the axle is damaged. I’m looking at a seal called axle saver. It’s a one piece constructed with oil seals at both ends and in the the bearing are packed with grease. Have you ever installed one with success?
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