A universal joint (also called a universal coupling or U-joint) is a joint or coupling connecting rigid shafts whose axes are inclined to each other. It is commonly used in shafts that transmit rotary motion. It consists of a pair of hinges located close together, oriented at 90° to each other, connected by a cross shaft. 4WD, AWD and RWD (rear-wheel-drive) vehicles have universal joints (or U-joints) at both ends of the drive shaft. U-joints connect to yokes that also allow drive shafts to move fore and aft as vehicles go over bumps or dips in the road, which effectively shortens or lengthens the shaft. đ Share, Comment, and save for more people to see. Thanks for your Support! #mechanical #engineering #automobile #vehicle #ujoint #universaljoint #driveshaft #rwd #awd #4wd #mechanism #rotary #motion #mechanic #automobileengineering #trepa #joints #foryou