It's too late now, just do it and see what comes out of it. The diff fluid is only a lubrication for the gears anyway, I don't think it changes the LSD since the LSD is in a sealed unit inside. I guess you can argue it can cool the LSD unit better as the fluid soaked in it can have a lower temp. Personally I will change it again at 6500 miles and see what it looks like. SInce I already have all the tools, the parts really only cost me $25 (2 quarts of 75W90 GL-5 fluid)
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