I had to have the engine replaced in my 2007 Magnum a Jasper long block engine was put in. I had the torque converter changed at the same time it is an aftermarket converter.
There was a vibration at around 2000rpm so the flex plate AND a second torque converter were put in the serpentine belt was removed, engine run but vibration was still there...………. WHAT COULD BE THE PROBLEM ????????????????