(Used) 2012 Allison (AT), TRANSMISSION ECM- ECM Model: A51, Serial Number: BK5536N1204704CD, Part Number: 29545536, Trans Model: 2200HS, Serial number: 6311117936, Voltage: 12V, Pin Plug: 80 Pins, Rectangular Plug, For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921