2006 Allison B500, Intercity/Tour Bus, Transmission Assys, Fits to: MCI D4500, (Used) 2005 Allison (AT), TRANSMISSION ASSEMBLY- Model: B500, Serial Number: 6610193152, Engine: Caterpillar C13 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# 6610193152, Casting# 6610193152, Truck Year 2006 1M8PDMDA96P057277