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  1. DN7050

    "Hidden" oil galley plug question

    Rebuilding a 1998 Vortec 5.7. Removed all the oil galley plugs for cleaning and found that the main oil galley running vertically from the oil pump to the oil pressure sender (and the oil galleys around the cam) had a large steel ball used as a plug between the oil filter send and return...
  2. DN7050

    Speedometer calibration

    I recently purchased a 1998 GMC Sierra 2500 (2WD, HD, long bed, extended cab, 5.7, 4L80E) which happens to be in almost new condition, no rust at all, looks new underneath and clean body too. Anyway the primary issue is the speedo reads about 15 mph high at 60 mph. I suspect the instrument...
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