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 31; Ratio All; 8.8 in. Diam. Ring Gear; C-Clip; FORD 8.8IN S/N....