TCS A518, A618, 47RE & 48RE Extra Heavy Duty 29 Spline Output Shaft for the Electronic Transmission A518, A618, 47RE, 48RE Heavy Duty 4x4 Output Shaft - Electronic Trans Increased shaft diameter from 1.230" to 1.480" for 20% additional strength. Output shaft is made from 9310 Vacumelt high strength billet steel. The radius has been increased to further protect areas prone to stress fractures. This shaft is designed for "EXTREME" service and performance applications. NOTE: This unit MUST be used with a 29 spline input gear 05086311-AA from NV 271 transfer case. Input must be shortened