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The ARB Air Locker differential fits GM 12‑bolt 8.9‑inch rear housings with 30‑spline shafts for gear ratios 3.73 and up, providing instant pneumatic locking to deliver full traction on demand while reverting to open differential operation when unlocked. Constructed with a steel‑reinforced, elastomer‑bonded seal and a durable two‑piece design, the kit includes the Air Locker, activation switch, solenoid valve, air line and bulkhead fitting; an air compressor is required and sold separately.
ARB Airlocker 8.9In 30Spl 3.73&Up Gm 12 Bolt S/N
