2008 Allison B500, Intercity/Tour Bus, Transmission Assys, Fits to: MCI D4500, (Used) 2007 Allison (AT), TRANSMISSION ASSEMBLY- Model: B500, Serial Number: 6610232831 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# 6610232831, Casting# 6610232831, Truck Year 2008 1M8PDMFAX8P058227