(Used) 2011 Allison (AT), TRANSMISSION ASSEMBLY- Model: B500, Serial number: 6610347099, Part Number: 29544592, Engine: Detroit 8V-71N, 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