(Used) 2004 Allison (AT), TRANSMISSION ECM- ECM Model: 5421-L, Part Number: 29542725, Serial number: BKDYPSM143502RCK, CIN:1B002D90013, Volts: 12, Transmission Model: 2200RDS, Serial number: 6310478808, 2 Rectangular Plugs with 32 Pins, 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