What causes a ford 302 vibration at a certain rpm?

What causes a ford 302 vibration at a certain rpm? - 1

It's the engine vibrating?
Or the car?

If it's the engine, it will vibrate in neutral/park without the car being in motion.

Is it an inline 4 cylinder? That type of engine would be. The most likely to vibrate, due to it's design.

Otherwise, there may be some rotating harmonic vibration due to an imbalance condition. Maybe even a loose flywheel. Or defective harmonic balancer.

If it's the engine vibrating, I would be tempted to remove all the belts, to isolate the engine from the accessories and run it for a few seconds to see. If maybe it's an accessory.

Hi with a FORD it usually could be anything. Why because they throw things together and that is why there are so many problems with a FORD.

Vibration Damper, Flywheel, bad torque convertor. I don't know

Broken motor mounts or trans mount or there loose even a U JOINT on the drive shaft will cause it. Also loose front end parts will too something is broken or loose maybe worn out