Universal joints are a noglory item. You can't chrome 'em, and they don't make you go faster. However, worn U-joints are a safety hazard and should be replaced at the first sign of a "clunk" in the ...

If you are transferring power in a straight line, you can use a shaft to accomplish it. Add angles and offsets though, and things get tricky. Now you need a universal joint. U-joints are used in ...