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When you use a CV joint, vibration is cancelled in the CV joint itself. Thus, geometrically, you want the lower U-joint operating at close to zero degrees nominal. (For longevity reasons, try to set the lower U-joint at 3-5 degrees. zero degrees does not move the roller bearings, and it does not lubricate and wears out faster) This U-joint then imparts no vibration, then, and all of the angle is carried by the CV joint. (Lower example below) |