(Used) 2006 Allison (AT), TRANSMISSION ECM - Part Number: Serial Number: A4100299, Model: 1000RM, Serial Number: 667966, Engine: Mercedes MBE 900, Transmission: P-50385 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