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Its been a known issue with the 4th gen trucks, and no fix for it yet. I believe its being caused by the MDS.
It will be interesting to know if the 2012 trucks have the same issues as the 09 10 11 trucks have.
Supposidly the 2012 trucks also have a different torque converter as well, i`m guessing it solves alot of vibrations and noises that the 09 10 11 had as well. Maybe the newer TC solves the buzzing in the gas pedals, steering wheels, drivers seat. I`m not putting alot of faith in it though.