100716V is a National differential pinion seal listed for the Ford F-250 Super Duty. The pinion seal closes off the differential where the pinion shaft exits the housing, keeping gear oil in and road contamination out. This is a genuine National part from Pro Gear and Transmission. Call us if you want help matching it to your axle. It is listed in our National Seals category alongside related National seals and O-rings.FeaturesNational differential pinion sealListed for the Ford F-250 Super DutyGenuine National part from Pro Gear and TransmissionTech SpecsBrand: NationalPart type: Differential Pinion SealApplication: Ford F-250 Super Duty