2018 Allison Other, School Bus, Transmission ECMs, Fits to: IC Corporation PB105, (Used) 2017 Allison (AT), TRANSMISSION ECM- ECM Model: A61, Part Number: 29556882, Serial Number: BK6882A171530059, Transmission information- Model: 2550PTS, Serial Number: 6311553039, 1 Rectangular Plug with 80 Pins, Reference images for condition. For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY, ELKTON, MD 21921, Serial# BK6882A171530059, Casting# BK6882A171530059, Truck Year 2018 4DRBUC8N7JB417017