Air Locker DifferentialAirLocker;DANA 44;33SPL;3.92/UP;S/N.Provides 100 Percent Traction On DemandDoes Not Affect Road Drivability/Driveline WearReduces Likelihood Of Vehicle Damage/Environmental ImpactEasy/Convenient OperationAllows Concentration On TerrainUltra Durable And Extremely StrongIncredibly Simple Yet Effective DesignEmploys Minimal Moving Parts Ensuring Maximum ReliabilityAir 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.Diffrl