When a car makes a turn, its outside wheels could travel up to 5 feet further than the inside wheels. Compensating for that is the job of your differential. Ask you service advisor for the recommended service interval. Proper service will help your differential last as long as possible. At Duffy's Repair Service in Ashland we install quality NAPA replacement parts. Give us a call at 804.798.5922 and let us help keep you safely and economically on the road.