2009 Allison 2200HS, Truck Delivery, Transmission ECMs, Fits to: Freightliner MT55 Chassis, (Used) 2008 Allison (AT), TRANSMISSION ECM- ECM Model: A51, Part Number: 29545536, Serial Number: BK5536N183300536, Transmission information- Model: 2200HS, Serial Number: 6310928833, Plug Pins: 80 Pins Plug Rectangular, 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, Serial# BK5536N183300536, Casting# BK5536N183300536, Truck Year 2009 4UZAARDU79CAL5115