ARB 4X4 Accessories Mitsubishi 9.5in. Air Locking Differential, Rear 31 Spline RD154 For Use With 31 Spline Axles;For Use With All Ratios;Air Activated Selectable Locker; Converts From Open Differential To fully Locked Or Spool; Simple Push Button Operation; Requires Air Compressor Sold Separately ARB 4x4 Accessories ARB Mitsubishi 9.5 Inch Air Locking Differential - RD154 RD154 Differentials