U Joint china Universal joints allow drive shafts to move along with the suspension while the shaft can be moving so power can be transmitted when the travel shaft isn’t in a direct line between 
your transmission and drive wheels.
Rear-wheel-drive vehicles have got universal joints (or U-joints) at both ends of the travel shaft. U-joints connect to yokes that likewise allow drive shafts to move fore and aft as vehicles go over bumps or dips in the road, which properly shortens or lengthens the shaft.
Front-drive vehicles also employ two joints, called constant velocity (or CV) joints, nevertheless they are a unique kind that also compensate for steering alterations.
On rear-travel vehicles, one indication of a donned U-join is a “clank” sound when a drive gear is engaged. On front-drive vehicles, CV joints often make a clicking sound when they’re worn. CV joints are included in protective rubber footwear, and if the boot styles crack or are in any other case destroyed, the CV joints will eventually lose their lubrication and be broken by dirt and wetness.
A U-joint is situated in both front wheel travel and rear wheel drive cars. Although they will vary in design, they possess the same reason for giving the drive teach some flexibility. That is necessary as all cars and trucks flex while in action.
U-joints are located on each of the ends of the rear travel shaft, whereas CV-joints are found on front wheel drive vehicles. Each allows the drive shaft to rotate as the differential movements in relation to the rest of drive train mounted on the chassis.
The U-joint functions to save wear and tear on your own vehicle’s transmission. Inability to have a universal joint substitute done when required can result in substantial harm to your car in the future.
There are several warning signs that U-joint or CV-joint is failing. They include: