Universal joints 
allow drive shafts to move up and down with the suspension as the shaft is usually moving so power can be transmitted when the drive shaft isn’t in a direct line between the transmission and drive 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 as well allow travel shafts to move fore and aft as cars review bumps or dips in the road, which effectively shortens or lengthens the shaft.
Front-drive vehicles also make use of two joints, called constant velocity (or CV) joints, however they are a numerous kind that also compensate for steering adjustments.
On rear-drive vehicles, one sign of a worn U-join is a “clank” sound whenever a drive equipment is involved. On front-drive automobiles, CV joints quite often make a clicking noises when they’re worn. CV joints are covered by protective rubber boots, and if the boot footwear crack or are normally destroyed, the CV joints will eventually lose their lubrication and be harmed by dirt and wetness.
A U-joint is found in both front wheel travel and rear wheel drive cars. Although they are different in design, they have the same U Joint china reason for giving the drive train some flexibility. That is required as all cars and trucks flex while in movement.
U-joints are located on each one of the ends of the trunk travel shaft, whereas CV-joints are found on front wheel drive automobiles. Each allows the travel shaft to rotate as the differential moves 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. Failing to have a universal joint alternative done when required can lead to substantial harm to your car in the future.
There are several indicators that U-joint or CV-joint is failing. They contain: