I had same kind of irrue with a Suburban. Pinion bearings loud. Dealer replaced them and 6000 miles later they wete loud agIn. I did myself 2nd time, 4 hours and $75 in parts. I do not think they cleaned after initial failure. I did with a lot of brake clean.
If they replace entire 3rd member you shoild be good to go. Likely either poor setup or just a bearing failure. Not common but it does happen.
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