(Used) 2013 Allison (AT), TRANSMISSION ECM- ECM Model: A51, Serial Number: BK5536N132460044, Part Number: 29545536, Trans Model: 2500RDS, Serial Number: 6311234813, 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