Universal joints allow drive shafts to move along with the suspension while the shaft is moving so power can be transmitted when the drive shaft isn’t in a right line between the transmission and U Joint china travel wheels.
Rear-wheel-drive vehicles have universal joints (or U-joints) at both ends of the drive shaft. U-joints hook up to yokes that also allow travel shafts to move fore and aft as automobiles go over bumps or dips in the street, which properly shortens or lengthens the shaft.
Front-drive vehicles also use two joints, called continuous velocity (or CV) joints, however they are a several kind that also compensate for steering changes.
On rear-travel vehicles, one sign of a put on U-join is a “clank” sound whenever a drive gear is involved. On front-drive vehicles, CV joints generally make a clicking sound when they’re donned. CV joints are included in protective rubber boot styles, and if the boot footwear crack or are otherwise 
broken, the CV joints will lose their lubrication and become harmed by dirt and wetness.
A U-joint is situated in both front wheel travel and rear wheel drive cars. Although they are different in design, they possess the same purpose of giving the drive teach some flexibility. This is necessary as all vehicles flex while in action.
U-joints are located on each one of the ends of the trunk drive shaft, whereas CV-joints are located on front wheel drive cars. Each allows the drive shaft to rotate as the differential moves in relation to the others of drive train mounted on the chassis.
The U-joint functions to save wear and tear on your vehicle’s transmission. Inability to get a universal joint substitute done when necessary can lead to substantial harm to your car in the future.
There are a few indicators that U-joint or CV-joint is failing. They incorporate: