(Used) 2011 Allison (AT), TRANSMISSION ECM- ECM Model: A51, Part Number: 29545536, Serial Number: BK5536N18330012B , 12 Volts A51003V1, CIN: 4A003V1005J, Transmission Model: 2200HS, Plug Pins: 80 Pins Plug Rectangular, Reference images for condition. ,