I think I found my vibration problem

I saw where you said this. But are you 100% SURE? Have you LOOKED? Have you turned the engine over a full 360* to look for the crescent missing from the flexplate? That's all I am trying to BEAT on is bein sure.

As for this, yes, I have turned this engine a full 360*. I have looked at the sticker on the flexplate and read the part #. 10237. I hve turned it around and saw the cutout on the plate. I also have looked through my paperwork and found where I purchased the flexplate along with the converter. I am sure I have a 10237 flexplate and sure I have a Hughes 24-30 torque converter. I am also sure I replaced the harmonic balanced a couple of months ago when the engine was out. I am almost sure it was external balanced and I got it from 440 source. I am going to look and find the receipt and verify this.