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The vibration is sitting still and going down the road. After driving awhile it seems to get some what louder as driving, also it seems to still be there over 2800 rpm but not as harsh.

well thanks for the answer, now back to the drawing board.

At idol or under power I have a strong vibration through out the car and can't seem to run it down. It's a 1965 mustang with a 289 slightly built with a c4 automatic. My question is could it have the wrong flex plate in it and how can I determine the correct balancer and flex plate it requires?