2011 Allison 2500PTS, School Bus, Transmission Assys, Fits to: Freightliner B2, (Used) 2010 Allison, TRANSMISSION ASSEMBLY- Model: 2500PTS, Serial Number: 6310989857, Engine: Cummins ISB 6.7, 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# 6310989857, Truck Year 2011, VIN 4UZABRDU2BCAU0225 4UZABRDU2BCAU0225