(Used) 2006 Allison, TRANSMISSION ECM- ECM Model: 5321-GM, Part Number: ATA4003, Serial Number: 45004U00018, Volts: 12, Transmission Model: 2200HS, Serial Number: 6310798421, 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