* Engine Mounts: The Cummins engine will require entirely new engine mounts to fit the Dodge chassis.
* Transmission: The gas engine's transmission likely won't be compatible with the Cummins. You'll almost certainly need a different transmission, along with the associated driveshaft modifications.
* Wiring Harness: The electrical systems are completely different. A new wiring harness will be needed to integrate the Cummins engine's electronics with the Dodge's systems.
* Fuel System: The gas engine's fuel system is irrelevant. You'll need a completely new fuel system, including a fuel tank, lines, and filter suitable for diesel fuel.
* Exhaust System: A diesel exhaust system is vastly different from a gasoline one, requiring a new exhaust manifold, piping, and muffler. You may also need to consider emissions compliance depending on your location.
* Cooling System: Diesel engines often have different cooling requirements than gasoline engines. Modifications to the radiator, hoses, and coolant may be necessary.
* Computer/ECU: The Cummins engine's computer (ECU) will need to be integrated with the vehicle's systems. This often requires custom programming or aftermarket solutions.
* Body Modifications: Depending on the specific Cummins engine chosen, you might need to make modifications to the engine bay to accommodate its size and components.
In short: While technically feasible, swapping a 5.9L gas engine for a Cummins diesel in a Dodge is a major project requiring significant mechanical expertise, specialized tools, and a considerable financial investment. It's a job best left to experienced mechanics or highly skilled DIYers with extensive experience in engine swaps. The cost of parts and labor could easily exceed the value of the vehicle.
