Magnum 5.9L vibration

I had a motor that had 4 spd dowell pins in it and had a vibrition with auto tranny on it. Drove me nuts figuring that out.

Achill said

Can you please explain a bit more? Did I get it correct that one of the reasons that my engine and transmission are not centered vs each other? Or?

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If the motor your using was originally a stick car and you just bolted an auto to it it will vibrate. My vibration wasn't bad a low rpm though. Just a thought and yes maybe not centered with eachother. I only say it cause it happened to me.
Hope you figure it out.