Universal joints allow drive shafts to move along with the suspension as the shaft is definitely moving so power could be transmitted when the travel shaft isn’t in a directly line between your U Joint transmission and drive wheels.
Rear-wheel-drive vehicles have got universal joints (or U-joints) at both ends of the drive shaft. U-joints hook up to yokes that also allow drive shafts to go fore and aft as vehicles review bumps or dips in the road, which efficiently shortens or lengthens the shaft.
Front-drive vehicles also make use of two joints, called regular velocity (or CV) joints, nevertheless they are a diverse kind that also compensate for steering alterations.
On rear-travel vehicles, one indication of a worn U-join is a “clank” sound whenever a drive gear is engaged. On front-drive automobiles, CV joints frequently make a clicking sound when they’re put on. CV joints are covered by protective rubber boot footwear, and if the footwear crack or 
are in any other case ruined, the CV joints will eventually lose their lubrication and become broken by dirt and wetness.
A U-joint is found in both front wheel drive and rear wheel travel cars. Although they are different in design, they have the same reason for giving the drive train some flexibility. That is needed as all vehicles flex while in movement.
U-joints are located on each of the ends of the rear travel shaft, whereas CV-joints are located on front wheel travel cars. Each allows the travel shaft to rotate as the differential techniques in relation to the others of drive train installed on the chassis.
The U-joint functions to save wear and tear on your own vehicle’s transmission. Failure to possess a universal joint alternative done when needed can lead to substantial destruction to your car in the future.
There are some warning signs that U-joint or CV-joint is failing. They include: