Brand New Tc Gp W/Hsg Surplus Caterpillar part number 1165811 The manufactured part # for this Torque Converter Group is 0R4985, However, this number is provided as a reference, as this torque converter group is brand new part # 1165811 or 116-5811. This is the torque converter and the housing in one. The torque converter is 116-5810 and the housing is 8E-3871. Used on: Off-Highway Truck