Base Cab & Chassis 2-Door. L6 DIESEL OHV Turbocharged. This is a used engine computer removed from a 1997 Ram 2500 Cummins diesel truck. The Mopar part number from the last authorized software update is shown as 56040504AC. This was removed from a running truck. This will fit 1997 Ram 2500 or 3500 models with a 5.9L Cummins engine, Federal emissions and an automatic transmission. If you are not sure whether your truck has California or Federal emissions, please message me with your VIN and I will try to help you determine. Reprogramming or Reflashing at a Ram dealer may be required in order to program your VIN into this computer. Check engine lights may be present if the computer is installed without reprogramming. Listing and template services provided by inkFrog.