Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use.
Common name for ball-and-socket joints used on steering arm ends and suspension components where two-directional movement is required between joined components. The ball joint consists of a shaft terminating in a ball which fits into a cup to give a wide area of movement. Once lubricated by grease or heavy oil, ball joints are now made with a mixture of plastic and metal, or with a plastic liner, eliminating the need for lubrication.