The rear differential plug put up a fight because the last person to check it put it back in with an impact driver, stripping the square drive socket. It took a spiral extractor to get it out. The filings on it aren't good, but they're typical for an axle of this age. It's slightly over full and doesn't smell like it has the correct additive.
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Extract rear differential fill plug; supply & install used OE plug $40 (done)
