2012 Allison 2500PTS, School Bus, Transmission Assys, Fits to: Freightliner B2, (Used) 2011 Allison (AT), TRANSMISSION ASSEMBLY- Model: 2500PTS, Serial Number: 6311045611, Engine: Cummins ISB 6.7, 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# 6311045611, Casting# 6311045611, Truck Year 2012 4UZABRDU4CCBH0164