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I also own an 07 GMC and change all filter a regular intervals. Hear's something I read and it turned out to be true. Gm and GMC trucks new from the factory are notorious for not enough differential fluid. I checked mine new and sure enough it was pretty low, same with a friends truck. granted this was in 07 but why not keep doing it to save money. Also read after a few thousand miles diff's should be emptied and refilled to get all the "stuff" cleaned out.
kevin
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