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Universal Joints (U-joints) are critical components in automotive drivetrains, facilitating power transmission from the engine to the wheels. They're particularly essential in rear-wheel drive vehicles and those with independent suspension systems. U-joints are designed to accommodate angular misalignment between two shafts, allowing for smooth rotation and efficient power transfer. They consist of a cross-shaped yoke with four trunnions or bearing cups, each of which houses needle bearings. These bearings enable the joint to bend in any direction while maintaining minimal friction. U-joints are typically made from high-strength steel alloys for durability and resistance to wear and tear. Regular maintenance and replacement of U-joints are crucial to ensure optimal vehicle performance, safety, and longevity, especially in automotive transmissions and differential repair contexts.