2011 Allison 2500PTS, School Bus, Transmission Assys, Fits to: Freightliner B2, (Used) 2010 Allison, TRANSMISSION ASSEMBLY- Model: 2500PTS, Serial Number: 6310991842, Engine: Cummins ISB, 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# 6310991842, Casting# 6310991842, Truck Year 2011 4UZABRDU3BCAU0248