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Re: Sbc vibration at 3000 rpm
Drive shaft is speed dependent - rotational speed that is. If that were the problem it should theoretically vibrate at 3,000 RPM speed in each of three gears. Is that the case here? If not x2 on checking dampener & flex plate.
And welcome to the forums Cole1969.
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1969 c-10 Step Side Long Bed. I-6 250cid =  = 1969 Pontiac GTO hard top. 400, 4-speed.
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