The cv joint is located at each end of the axle assembly and is most often used on front wheel drive cars. A 2wd vehicle will have 2 axles with 4 cv joints and boots. A 4wd will typically have twice as many as the 2wd. The cv joint allows the wheels of the vehicle to turn while still being able to put power to the wheels.
The most notable indicator of a worn out cv joint is the loud clicking noise you hear when you turn the steering wheel. If your car or truck is making a bad click click noise when you either accelerate or turn, then you need to immediately replace the CV joint Kit. The CV Joint kit comes with all the parts necessary to replace the joint including the boot, clamps, bolts, gland nut and grease.