Big tires and big obstacles can rob you of torque, traction, and possibly wheel speed. Changing axle gear ratios can help and is most often done to restore reasonable gearing for on-road driving with ...

There are gears for going fast and gears for going slow. Would you like to do both? A lot of us do. We'd like to be able to go from doing 70-mph down the highway to crawling a 1/2-mile of trail in an ...