New to the site, so I'm not sure if I'm in right place.
But, I've been having a vibration in my 2006 4x4 3500 dually manual 6 speed, for a while now. Its at its worst when idling with clutch in or out. After take off, 1000 RPMs, its seems to just go away. I changed the harmonic balancer but its still doing the same thing. Engine runs great except for the vibration. Any suggestions are appreciated.