Drivetrain Vibration

oldkimmer said
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

Yes it´s the correct internal balanced crankshaft.
Obviously the crankshaft was balanced WITH counterweights (weight of rods + pistons) and WITH 904 flexplate (not modified) AND harmonic balancer.
BEFORE I had vibrations (car not moving) = ENGINE VIBRATIONS.
NOW it is only vibrating when the car is MOVING (neutral or in gear) = DRIVETRAIN VIBRATIONS.

BEFORE the crankshaft balancing i thought it´s the converter.
I bought a new one and after a short drive it broke down.
BUT it was the SAME vibration like before.

I described my problem many times before. (It`s an advantage to have the ability to fn read) ;)