F250 Pick-Up; 10.50 Ring Gear; Non-Locking. Differential Pinion Bearing. Includes Rear Pinion Bearing Cup. Rear Ring Gear 10.25". Single Rear Wheels. The housing of a Differential that holds The Gears, Pinions, Differential case, etc. Assembly - Driving Pinion. Axle housing. Carrier Assembly. Dust seal. Flange Nut. Inner.