I have a 2012 GMC Sierra 4.3L V6 automatic transmission and the problem I have is a pronounced buzzing/humming noise when I accelerate in 2nd and 3rd gear. The sound seems to happen more often when its around 1500 RPM or keeping a steady speed around 20-40 MPH. The question is could that be a transmision problem or one of my belts going bad?
Apr 17, 2013 at 11:53 AM