Soft Caterpillar 6060251-00. Articulated Truck software for Trans/Chassis ECM. Serial Number Prefixes TFB, TFF, TFH, LFB, LFF, LFH, 2T3, 2T4, 2T5, 2L6, 2L7, 2L8 (& TFJ, TFK, TFN, LFJ, LFK, LFN when fitted with Transmission Iron T