2018 Allison Other, School Bus, Transmission Assys, Fits to: IC Corporation PB105, (Used) 2018 Allison (AT), TRANSMISSION ASSEMBLY- Model: 2550PTS, Serial Number: 6311553039, Engine: Cummins ISB, 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# 6311553039, Casting# 6311553039, Truck Year 2018 4DRBUC8N7JB417017