Drive shafts, output yoke and U-joint are all moving together at the same speed. The angle of the front of the shaft doesn’t allow it to turn in a circle. Instead, you’ll have an ellipse that causes the drive shaft to slow and accelerate to keep up with the output yoke.
The drive shaft shifts in speed whenever the output of the U-joint speed changes. It is crucial that the rear and front yoke’s operating angles match. You can ensure that the shaft is turning at the same speed as the member driving it.
The drive shafts that aren’t in phase won’t rotate at a constant rate. If you’re lacking an appropriate phasing system in your drive shaft components and it could affect the way they function. It’s a good idea to note all of the components prior to putting them back together. This will ensure that you have the correct phasing and reduce the chance of experiencing vibration in the driveline.