Answer: Again, the most common problem with locking hubs is that they won’t engage the front differential. This problem may be accompanied by grinding noises when you try to shift your vehicle into four-wheel drive. If you hear a grinding noise when you shift to four-wheel drive or if your vehicle is getting poor traction in the snow and ice, you should have your locking hub inspected and replaced if necessary. The other issue with locking hubs is that the hub stays locked and won’t disengage the front wheels. When this occurs, your vehicle will be difficult to steer at lower speeds. Again, if you suspect you have a problem with your locking hub, have it inspected and replaced if necessary. Technicians recommend that you have your locking hubs serviced and inspected every two years or 25,000 to 30,000 miles. However, if your vehicle’s four-wheel drive system is used more extensively, you should have your locking hub inspected every year.