The 6.7 Cummins engine, known for its robust power and reliability, is a popular choice for engine swaps, particularly in second-generation Dodge Ram trucks. This guide dives deep into the complexities of this swap, addressing common questions and providing insights for those considering this ambitious project.
Why Swap a 6.7 Cummins into a Second-Gen Dodge Ram?
The allure of a 6.7 Cummins swap in a second-gen Dodge Ram (1994-2002) is strong. Second-gen Rams are beloved for their classic styling and simple mechanicals. However, their factory engines often lack the power and torque of modern diesels. A 6.7 Cummins swap delivers a significant performance upgrade, transforming a vintage truck into a modern powerhouse. The increased power and reliability are major selling points for enthusiasts.
What are the Challenges of a 6.7 Cummins Second-Gen Swap?
This isn't a weekend project. Swapping a 6.7 Cummins into a second-gen Ram presents significant challenges:
- Engine Bay Space: The 6.7 Cummins is considerably larger than the factory engine, requiring extensive modifications to the engine bay. This often includes firewall modifications, custom mounts, and potentially even frame modifications.
- Transmission Compatibility: Matching the 6.7 Cummins to a suitable transmission is crucial. The stock transmissions in second-gen Rams aren't designed for the torque of a 6.7 Cummins, necessitating the use of a more robust transmission, likely a 68RFE or an Allison automatic. This adds complexity and cost.
- Wiring Harness: Integrating the 6.7 Cummins' complex wiring harness into the older truck's electrical system demands significant electrical knowledge and expertise. This often involves custom wiring solutions and potentially the use of aftermarket controllers.
- Exhaust System: A custom exhaust system is essential due to the size and location of the 6.7 Cummins. Proper routing and design are critical for optimal performance and to meet emission standards where applicable.
- Cooling System: The 6.7 Cummins' higher operating temperatures necessitate a more efficient cooling system. This may involve upgrading to a larger radiator, adding auxiliary cooling fans, and potentially modifying the cooling system layout.
What Parts Are Needed for a 6.7 Cummins Second-Gen Swap?
A successful 6.7 Cummins swap requires a comprehensive parts list, including:
- The 6.7 Cummins engine: Source a complete and functional engine, ideally with low mileage.
- Transmission: A compatible automatic transmission, such as a 68RFE or Allison.
- Engine Mounts: Custom-fabricated engine mounts are essential to secure the engine in the modified engine bay.
- Wiring Harness: Either a modified factory harness or a custom harness will be necessary.
- Exhaust System: A custom exhaust system designed for the 6.7 Cummins and the modified engine bay.
- Cooling System Components: A larger radiator, upgraded water pump, and potentially auxiliary cooling fans.
- Driveshaft: A custom-length driveshaft is often necessary to accommodate the new transmission and engine.
- Transfer Case: A suitable transfer case may need to be sourced depending on the chosen transmission.
What is the Cost of a 6.7 Cummins Second-Gen Swap?
The cost of a 6.7 Cummins swap can vary greatly depending on the condition of the parts, the labor involved, and the level of customization. Expect to invest a significant amount of money, potentially exceeding $20,000, excluding the cost of the donor truck. This cost considers engine, transmission, fabrication, wiring, and labor.
How Long Does a 6.7 Cummins Second-Gen Swap Take?
The timeframe for this project can range from several months to over a year, depending on your mechanical skills, available resources, and the level of customization. It's a time-intensive endeavor requiring meticulous planning and execution.
Is it Worth it to do a 6.7 Cummins Second-Gen Swap?
The decision to undertake a 6.7 Cummins swap is a personal one. While it offers significant performance gains and a unique custom build, it's a challenging and costly undertaking. Weigh the pros and cons carefully, considering your mechanical skills, budget, and available time before embarking on this project. The reward of driving a powerful, custom-built truck is significant, but only for those prepared for the journey.
This guide provides a starting point for your research. Further research and consultation with experienced mechanics specializing in diesel swaps are highly recommended before beginning this project. Remember, safety and proper execution are paramount.
