I am so bummed right now.Had new MP crate motor 360/300hp installed, along with TCI 727 and Torque Converter.There is an awful vibration without even driving.Bring it up to about 2K rpm and whole car shakes.The motor of course is externally balanced.The flexplate is bM #10242, which is supposed to be nuetrally balanced.Mechanic who did install said there was a big weight on the new converter.I was very clear with TCI sales person that it was for Magnum 360.I don't know what to do.Mechanic can't figure out why.Does it with car parked, so I guess that eliminates driveshaft,U joints, etc. What do I do now? I don't know where to turn.

Thanks. Larry