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Ideally, a driveshaft would be positioned at a 0-degree angle, or parallel to the ground, but this isn't possible due to the packaging limitations of production car-based chassis. Such an arrangement allows both U-joints to operate at the same velocity, which minimizes wear, vibration, and parasitic power loss. As soon as any angle is introduced into the driveshaft, the U-joints begin traveling in an elliptical path instead of a circular path, and cause vibrations. Improperly phased U-joints make this condition dramatically worse, so it's imperative for driveshaft manufacturers to position the front and rear U-joints in line with each other. View Related Article
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