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New 2004 2500HD with a leaking rear differential fill plug, oil all over the spare tire. Will take it in to the dealer to top off and figure out why it's leaking. I snugged it up for now, but it felt like it already had about 25 ft/lbs on it which is the torque spec I think. Is the plug supposed to have a gasket on it? Probably not much more than 500 miles on it, so don't think it would damage anything yet, at least I hope not! Edited by: srode