Toyota FJ 4.88 Ring & Pinion. High performance Yukon Ring & Pinion gear set for Toyota V6 (also 4Runner and Tacoma with locker) in a 4.88 ratio. Yukon exclusively uses 8620 steel in all their Ring & Pinion sets for high strength and long life. They use the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon Ring & Pinion sets come standard with a one-year warranty.