The rumbling power of a 6.7 Cummins engine is undeniably alluring. For owners of second-generation Dodge Rams (typically 2003-2009), the idea of swapping in this powerhouse is a tempting prospect, promising a significant upgrade in performance and torque. However, a 2nd gen swap of a 6.7 Cummins isn't a simple bolt-on affair. It’s a complex project demanding significant mechanical expertise, time, and financial investment. This guide explores the intricacies of this ambitious undertaking, addressing common questions and concerns.
What's Involved in a 2nd Gen 6.7 Cummins Swap?
A successful 6.7 Cummins swap into a 2nd gen Dodge Ram requires meticulous planning and execution. It's not just about dropping in the engine; you'll need to address numerous compatibility issues. This includes:
- Engine Mounts: The 6.7 Cummins is considerably larger and heavier than the factory engines in 2nd gen Rams. Custom engine mounts are absolutely necessary.
- Transmission: The 6.7 Cummins typically uses a different transmission than the 2nd gen's stock offering. This often necessitates a transmission swap as well, adding complexity and cost.
- Wiring Harness: The 6.7 Cummins' electrical system is vastly different. A custom wiring harness or significant modification of the existing harness is crucial for proper operation.
- Exhaust System: A custom exhaust system will likely be needed to accommodate the larger engine and comply with emissions regulations (where applicable).
- Cooling System: The 6.7 Cummins requires a more robust cooling system. Radiator upgrades, larger fans, and potentially even upgraded coolant pumps are often necessary.
- Fuel System: Modifications to the fuel system might be required to handle the increased fuel demands of the larger engine.
- Computer/ECU: Proper tuning and calibration of the engine control unit (ECU) are crucial for optimal performance and reliability. This often involves custom programming.
- Driveshaft: The length of the driveshaft may need adjustment to accommodate the new engine and transmission combination.
Is a 2nd Gen 6.7 Cummins Swap Worth It?
The appeal is obvious: substantially increased power and torque. However, the cost, complexity, and potential unforeseen challenges should be carefully weighed against the benefits. The total cost can easily reach tens of thousands of dollars, depending on the parts chosen, the amount of custom fabrication required, and whether you perform the work yourself or hire a professional.
What are the Common Problems Encountered During a 6.7 Cummins Swap?
Several potential pitfalls can complicate the swap process. These include:
- Finding Suitable Parts: Sourcing all the necessary parts, especially custom-fabricated components, can be challenging and time-consuming.
- Complexity of the Wiring: The electrical system is intricate. Incorrect wiring can lead to engine malfunctions or even damage.
- Fitting Everything Under the Hood: The larger engine may require modifications to the engine bay to ensure proper fitment.
- Cost Overruns: Unforeseen complications can easily inflate the project's budget.
How Much Does a 6.7 Cummins Swap Cost?
The cost can vary wildly, ranging from $15,000 to $30,000 or more, depending on your choices. The price depends heavily on whether you source used parts, buy new components, and whether you do the labor yourself or hire a professional shop to do the installation. Remember to factor in the cost of any unforeseen complications.
What Transmission Works Best with a 6.7 Cummins Swap in a 2nd Gen Ram?
The choice of transmission is critical. The 68RFE automatic transmission is often paired with the 6.7 Cummins in factory applications, making it a popular choice for swaps, although significant adaptation is still required. Manual transmission swaps are considerably more complex.
Is it Legal to Perform a 6.7 Cummins Swap?
The legality depends heavily on your local regulations and emissions standards. In some areas, modifications that significantly alter the vehicle's original specifications might require inspections and certifications. Always check with your local Department of Motor Vehicles (DMV) or equivalent authority before proceeding.
This detailed overview provides a comprehensive understanding of the intricacies involved in a 2nd gen 6.7 Cummins swap. Remember, this project is a significant undertaking requiring significant mechanical skills, resources, and planning. Thorough research and careful consideration are crucial before embarking on this ambitious modification.
