Top Picks For Axle Shaft Related Parts

There are several components related to the axle shaft and its assembly, including parts like axle hub, axle hub bearings, axle shaft, CV joints, CV shafts, axle shaft bearings, spindle, etc. These components make up the drivetrain assembly and work together to make the vehicle move. Axle hubs are cast or forged components attached at the end of the axle shafts to which the wheels are bolted and are also known as wheel hubs. Axle hub bearings fit between the axle hub and shaft for smooth wheel rotation. CV joints are used on CV axle shafts that are used on vehicles with independent suspension setups and allow power transfer at various angles as the wheels move up and down over bumps.

A CV (constant velocity) shaft is used on almost all modern vehicles with front or rear-wheel drive to allow power transmission at a wide range of angles. CV axle shafts have two CV joints on either end that allow the wheels of the vehicle to be powered while they move over the bumps and turn at the same time according to the steering input. The term constant velocity means that irrespective of how the outer CV joint turns, it will always remain at the same speed as the inner. The CV joints are filled with grease and are covered with boots that protect the grease from leaking, keeping the joints lubricated. In front-wheel-drive cars, ball-type CV joints are used on the outer side, whereas tripod-type CV joints are used on the inner side.

CV shafts are direct links that are used to transmit power from the vehicle’s transmission to the wheels and are subjected to high levels of stress, which cause them to wear out. The most common symptom of a failing CV shaft is a clicking noise, which is caused by a failing CV joint. This noise is generated especially while turning the vehicle and increases on sharper and faster turns. Usually, a torn boot causes the grease to spill out, decreasing the lubrication of the CV joint, eventually causing it to fail. Furthermore, excessive vibration that can increase with speed is another sign of a failing CV axle. In case you notice these symptoms while driving your vehicle, get your CV shafts checked and replaced to avoid major issues like loss of control and a total breakdown.

CV joints are covered by a rubber or plastic boot, also known as CV boots or drive-axle boots. These boots protect the joints and their bearings from external elements like dirt, water, and debris. The boot also holds the grease that lubricates the movement of the bearings as the joint operates. Apart from protecting the CV joint, the CV boots also support the dynamic movement of the joint without any resistance. It compresses and expands without stretching as the CV joint operates at various angles. CV boots are usually made from rubber and other materials like polyurethane or neoprene for increased durability. The boots are kept in place together by clamps or bands at both ends that offer a tight seal.

Over time, the CV boots can tear up due to normal wear and can be punctured by loose debris while driving on rough terrains. Usually, the boots on the outer CV joints wear quickly compared to inner ones as they are subjected to rougher conditions. Regardless of how the damage occurs, a failed CV boot will contaminate the grease with dirt and debris, thereby increasing wear on the joint and damaging it. A torn or cracked CV boot wouldn't show any symptoms as such, however, minor signs can be noticed upon a visual inspection, which includes cracks, dark-colored deposits due to leaking grease, or completely ruptured boot. If you notice any cracks, tears, or grease deposits on your boots, it is likely that they might be failing and should be checked and replaced.

An axle shaft is a solid steel shaft that transfers the motion from the differential to the wheels of the vehicle. They are usually found in pairs and rotate independently so the differential can turn them at different speeds for traction. An axle shaft features splines machined into each end to engage with the differential and the drive flange. It can also comprise splines on the differential end and a flange on the other to mount a wheel to the axle. The design depends on the type of axle and the former is used with a full-floating axle, whereas the latter is mostly used in passenger cars and light trucks. The axle shafts are made from hardened steel, which allows them to transfer power to the wheels while withstanding twisting forces and stresses. 

Although the axle shafts are built to be tough, they can wear out or break under severe conditions and prolonged use. One of the first signs of a bent or broken axle shaft is intense wobble or vibration while driving. A damaged axle will also misalign the wheel, which can be easily spotted upon visual inspection. This can cause the brakes to malfunction as the brake pads slowly become misaligned with the wheels and begin to drag on the rotors, generating a lagging feel. These signs are a clear indication of a potential problem with the axle shaft, which might need an immediate replacement.

A front hub assembly is a pre-assembled unit that carries bearings, seals, sensors and is also known as a wheel hub unit, wheel hub, etc. It is a crucial component that keeps your wheel attached to your vehicle and allows them to rotate and steer safely. The wheel hub assembly is found at the center of the wheel and houses the bearings that assist in the smooth rotation of the wheels. Modern wheel hub assemblies are also equipped with wheel speed sensors to control your vehicle's ABS system and traction control systems (TCS). The wheel studs are an integrated part of the wheel hub assembly which are used to connect the wheel and the brake rotor.

A wheel hub assembly is designed to withstand tough conditions and last a long time, but they take a lot of abuse and can often wear out prematurely, showing some symptoms that can be easily recognized. Grinding or roaring sounds from the wheel indicate a worn-out bearing of your wheel hub assembly. A loose or vibrating steering wheel and a clicking noise from the wheel, which increases with speed, are other signs of a potential wheel hub assembly failure. A better way to ensure your wheel hub assembly is damaged is to check for wheel play when the vehicle is lifted on a jack or lift while carrying out routine maintenance. If it shows any play or the above-mentioned symptoms, then your wheel hub assembly might be at fault and should be replaced immediately.