A u-joint essentially has a "gear ratio" that follows a sine wave pattern when running at an angle. In other words, the output speed goes up and down relative to the input speed. An "equal angle" driveline always has two u-joints that run at the same angle and are in phase with each other. This results in the speed ratios canceling themselves out and the output speed then equals the input speed of the system. (A CV joint works exactly the same way except it two u-joints bundled into a single package.) However, if your driveline has only one u-joint that bends when you turn the input speed going into the implement is pulsing up and down. This is what causes the chatter.
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