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Cardans All OverSince U-joints travel in an elliptical path, they create unequal amounts of centrifugal force as they rotate. By setting up a standard driveshaft to have both U-joints operating at the same, but opposite, angles, these centrifugal forces cancel each other out. While commonly referred to as a CV joint in four-wheel vernacular but not literally a true Constant Velocity joint, a double-cardan-type driveshaft end uses two U-joints located in a housing that only allows them to travel in equal but opposite angles. This cancels out the harmonics that would otherwise affect the tube on that side and is why the U-joint end of a double-cardan driveshaft needs to operate at a 0-degree angle.