Air locker locking differentials allow you to tackle the toughest terrain. The worlds premier traction aid, ARB air lockers keep you moving in all conditions.A complete air locker kit: replacement differential, activation switch, solenoid valve, air line and bulkhead fittings. ARB Air Locker Differential; Shaft Spline 35; Ratio All; 1.5in. Diam. Axle Shaft; FORD 10.25/10.5IN S/N....