How is the flex plate balanced?

[nielsmobers]

After I removed the transmission I discovered that the transmission mount was gone completely, I've replaced it and it seems that the vibration is under control. The vibration wasn't the problem, but muffling this vibration was. I assume that most mustangs have a little vibration, or not?? Looking back I feel stupid that I've replaced everything except the mounts. Two times I brought my car to a shop to let them discover where the vibration came from, they also didn't detect the broken mount!?! There's one advantage, I no longer need the repair manuel to remove the transmission...

I want to thank you guys for the very helpfull replies, you helped me discover a lot about my car.

Niels