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Final answer:The d. 1480 series U-joint has the greatest torque capacity compared to the 1260, 1310, and 1350 series U-joints, with generally higher series numbers indicating a stronger U-joint capable of handling more torque.Explanation:The torque capacity of a universal joint (U-joint) indicates the amount of torque it can safely transmit without failure. When comparing U-joint series by their torque capacity, the 1480 series U-joint has the greatest torque capacity compared to other options listed such as 1260, 1310, and 1350 series U-joints.Generally, the higher the series number, the larger and stronger the U-joint, allowing it to handle more torque. Therefore, for the given options—1260, 1310, 1350, and 1480—the correct answer is the 1480 series U-joint....