Rear High Performance Ring and Pinion Gear Set (YGD80-513) by Yukon Gear and Axle. Ratio: 5.13. Yukon Ring and Pinion sets give you the confidence of knowing you�re running gears designed for the harshest of conditions. Whether it�s on the street, off-road, or at the track; Yukon ring and pinion sets deliver unrivaled performance and quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring and pinion sets come standard with a one-year warranty.