i have a 2003 2500 and while driving now it makes a sort of humming noigse coming fromt he front end. i took the brake pads off and spun it and still hear it. sounds like it is coming from the fron dif. anyone have any ideas to what this could be? it is a constant noise but it gets louder around 35mph and keeps going until you stop.any help is appreciated. the dealer didnt help one bit
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2004 2500 cummins 6 spd. quad cab. triple piller gauges, rest stock