Replacement Driveline & Axles
U-Joints: Identification, Selection, and Replacement
A "u-joint", or universal joint, is a coupling that connects two shafts that are at different angles to one another, in a fashion that allows both to rotate freely without excess friction. Essentially, a u-joint is formed from multiple pieces - some of which are permanently attached to the ends of the shafts themselves. U-joints can be located along driveshafts, 4WD transfer case shafts, and even axle shafts. U-joints are different in design from constant velocity joints, and are sometimes referred to as Cardan joints or Spicer Joints.