4000 RPM vibration - 67 barracuda

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MagnumBarracuda

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I noticed a very distinct vibration in my car at 4000 RPM only. Below and above that, there is nothing. The car does not shake but the vibration is very noticeable. The vibration occurs when driving and parked, clutch in or clutch out. I have have had new motor in the car for about a year and has had 0 issues until now. Exhaust is not contacting anything on the car. The motor mounts and trans mount were new with the install, they are all bolted tight and look undamaged. While driving around a few times with this issue, my clutch pedal has become twice as hard to press down. Flywheel and clutch were balanced and reinstalled with new engine. Has anyone experienced something like this before?


EDIT: Clutch is Centerforce and overcenter spring is still on pedal assembly, per previous owner.
 
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