Drive Train System Bearings are the load-carriers inside virtually every part of the drivetrain. Bearings are used to support loads and reduce friction of rotating parts in transmissions/transaxles, transfer cases, universal joints, front and rear drive axles, axle hubs, and wheel hubs among others. Seals are used most often to keep grease, oils, and other lubricants from leaking out, but also to prevent dirt from getting in. Check your cars maintenance schedule for recommended bearing service intervals. Typically, the only bearings requiring regular service are wheel bearings. Although many cars have non-serviceable, lubed-for- life wheel bearings in front, there may still be serviceable bearings in the rear. Most SUVs and pickups still need regular front wheel bearing maintenance. Have the bearings cleaned, inspected and repacked with fresh lubricant every two years or 24,000 miles. If the wheel bearings are exposed to any underwater conditions, even for a short period, the bearings need to be serviced more frequently. The wheel seals should also be replaced every time the bearings are serviced. Symptoms of a faulty wheel bearing include a growling or metal-to-metal noise from one of the wheels while the vehicle is moving, wandering steering, or a seized wheel. If you suspect a bad wheel bearing on your car, have it checked out by one of our qualified service professional as soon as possible.