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If the noise goes away on decel then it is gear noise. Bearings are usually a grinding type noise. It is basically nothing to worry about if there are no other issues unless the noise just bothers you. This was very normal for NBS trucks, my mom's 05 whined from the day she got it at 60k miles and it has 200k on it now (every NBS SUV I've driven does it). My 12 does it with 185k miles on it.