The U-joint and the other components are moved at the same speed. The drive shaft cannot move in perfect circles anymore because of an operating angle in front. It’s a ellipse which forces the drive shaft to go into increasing speed or slowing down in order to keep pace with the output yoke.

The drive shaft shifts in speed whenever the output of the U-joint speed changes. This is the reason it’s important to make sure that your operating angles on the front yoke and the rear yoke coincide with each other. So, you’ll have continuous rotation for the part that is driven by the drive shaft.

A drive shaft that isn’t properly synchronized won’t be rotating with a consistent speed. If you don’t have the proper phasing in your drive shaft’s parts and it could affect how they operate. It is a good idea to mark all parts prior to placing them in. This will help ensure your phasing remains in order and decrease the risk of experiencing vibration in the driveline.

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