ARB 4X4 Accessories Air Locking Toyota 8in. IFS Differential, Front 30 Spline (3.91+) RD113 For Use With 33 Spline After Market Axles;For Use With 3.92 And Up Gears;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 Dana 44 33 Spline 3.92 Up Air Locking Differential - RD113 RD113 Differentials