Richmond Gear 6903101 Gear 4.10 Ford 8.8In Ratio: 4.10 Teeth: 41-10 Use Installation Kit #836-83-1043-1 1981-94 Bronco, 1981-2002 F-100/F-150 except 5.4L, 1983-84 F-250, 1985-2002 Mustang, 1990-98 Ranger 4.0L, 1990-2002 Explorer, 1997-2002 Expedition except 5.4L