Soft Caterpillar 6109751-00. Articulated Truck software for Transmission ECM. Serial Number Prefixes 3T9, 3T3, 3T4, 3T5, 3T6, 3T7, 3T8, 3F3, 3F4, 3F5, 3F6, 3F7, 3F8 - Transmission 6109751V00 MAY 06, 2021 LOC 01 General