Universal joints allow travel shafts to move along with the suspension while the shaft is certainly moving so power could be transmitted when the travel shaft isn’t in a straight line between the transmission and travel 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 also allow travel shafts to move fore and aft as automobiles go over bumps or dips in the street, which efficiently shortens or lengthens the shaft.
Front-drive vehicles also work with two joints, called regular velocity (or CV) joints, nonetheless they are a different kind that also compensate for steering changes.
On rear-drive vehicles, one indication of a donned U-join is a “clank” sound when a drive gear is involved. On front-drive automobiles, CV joints generally make a clicking noise when they’re donned. CV joints are covered by protective rubber boot footwear, and if the boot U Joint china footwear crack or are normally 
broken, the CV joints will eventually lose their lubrication and become broken by dirt and dampness.
A U-joint is situated in both front wheel drive and rear wheel drive cars. Although they are different in design, they have the same reason for giving the drive coach some flexibility. This is necessary as all cars and trucks flex while in action.
U-joints are located on each one of the ends of the rear travel shaft, whereas CV-joints are located on front wheel drive automobiles. Each allows the drive shaft to rotate as the differential movements in relation to the others of drive train installed on the chassis.
The U-joint functions to save lots of wear and tear on your vehicle’s transmission. Inability to have a universal joint substitute done when needed can result in substantial destruction to your car in the future.
There are several warning signs that U-joint or CV-joint is failing. They incorporate: