2011 Allison 2500PTS, School Bus, Transmission Assys, Fits to: Freightliner B2, (Used) 2010 Allison (AT), TRANSMISSON ASSEMBLY- Model:2500PTS, Serial Number: 6310991437, 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# 6310991437, Casting# 6310991437, Truck Year 2011 4UZABRDU9BCAU0240