Found in the suspension of virtually all modern cars, ball joints are an important part of the suspension system. They are one of the main suspension pivot points that connect the control arms of the vehicle to the steering knuckles or spindles. The front ball joints also allow the front wheels and suspension to move back and forth, as well as up and down, as the steering wheel is turned during driving and as the car moves over uneven road surfaces.
A ball joint is usually a ball-in socket design, lubricated with grease and covered with a dust boot. Modern ball joints are sealed, while this prevents dirt, grit and other impurities from damaging the joint, it also prevents maintenance. This means that if you have a problem with your ball joint, the entire assembly will usually need to be replaced.
Depending on the type of suspension, most cars have both upper and lower ball joints. The lower ball joints are usually larger and wear out faster due to the weight of the front of car that rests on them.
Parts that are made from premium materials with an innovative design have greater strength and durability. MOOG ball joints are made from superior compounds that are better able to cope with high temperatures, dirt and abrasion. The housings are forged from a single block of fine-grain alloy steel for greater strength.

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