Drivetrain Vibration

U can’t just balance the crankshaft and the balancer and flex plate. The pistons and rods need it also. U may of just made it worse. Did u have the motor out for balancing? Running in neutral or park car not moving then like stated it’s in the motor or tranny/converter/flex plate. Why no pics of the modified flex plate, balancer. Is the correct crankshaft in it. Have u verified it as such. If ur confident the motor is good that leaves the flex plate, converter and or tranny. But that may only be 1 of the problems as when driving that can and does create new vibes. I can’t for the life of me figure why u put the old converter back in when u knew u had these vibes. Post some dam pics if u want some fn help. Kim