I am not new to diesels or turning wrenches but this is my first Cummins and could use a hand.. I bought a 2013 Ram 2500 mega cab 4wd and when I engage 4wd I get a popping on the drivers front only under power. It feels like an old school Chevy auto hub when they go bad. Every time I give it some power I get a ( clang, clang, clang ) until I let off the torque. If I'm just driving without giving it and real pedal it does not make any noise. Could I have some axle splines slipping or something?