Universal joints allow drive shafts to move up and down with the suspension while the shaft is usually moving so power could be transmitted when the drive shaft isn’t in a right line between the transmission and travel wheels.
Rear-wheel-drive vehicles have universal joints (or U-joints) at both ends of the travel shaft. U-joints hook up to yokes that also allow travel shafts to go fore 
and aft as cars go over bumps or dips in the road, which successfully shortens or lengthens the shaft.
Front-drive vehicles also make use of two joints, called frequent velocity (or CV) joints, however they are a several kind that also compensate for steering adjustments.
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 cars, CV joints quite often make a clicking noise when they’re worn. CV joints are included in protective rubber shoes, and if the footwear crack or are normally ruined, the CV joints will eventually lose their lubrication and become damaged by dirt and dampness.
A U Joint china U-joint is found in both front wheel travel and rear wheel drive cars. Although they will vary in design, they have the same reason for giving the drive train some flexibility. This is necessary as all vehicles flex while in movement.
U-joints are found on each one of the ends of the trunk travel shaft, whereas CV-joints are located on front wheel drive cars. Each allows the drive shaft to rotate as the differential techniques in relation to the others of drive train attached on the chassis.
The U-joint functions to save wear and tear on your vehicle’s transmission. Inability to get a universal joint alternative done when needed can lead to substantial damage to your car in the future.
There are some indicators that U-joint or CV-joint is failing. They involve: