Diesel enthusiasts know that nothing beats a Cummins swap for raw power, unmatched durability, and the sheer satisfaction of breathing new life into your favorite rig. Whether you’re upgrading for off-road domination, towing capacity, or just chasing the dream of the perfect build, a Cummins diesel swap has become the gold standard.

Let’s dive into everything you need to know—from choosing the best Cummins engine for your project to tackling specific swaps like a Ford Cummins swap or a square body Chevy Cummins swap.

The Cummins Swap: An Overview

Cummins engines have earned their legendary status for one key reason: they deliver. Known for their durability, impressive torque, and unrivaled reliability, Cummins swaps are the ultimate upgrade for anyone serious about performance.

At Diesel Power Products, we’ve seen it all—classic Chevy restorations, Ford builds, and even custom Jeep projects outfitted with Cummins engines. With our expertise and an extensive range of Cummins engine parts and swap kits, we make it easy for enthusiasts to turn any vehicle into a high-performance machine. Whether you’re swapping to improve towing capabilities or to dominate off-road trails, Cummins delivers the results you’re looking for.

Why Choose a Cummins Diesel Swap?

For decades, Cummins engines have been a go-to choice for diesel fans—and for good reason. They’ve earned a legendary reputation for unmatched reliability, raw power, and the kind of longevity that diesel builds demand. Whether you’re upgrading an aging Powerstroke, building a custom off-road beast, or maximizing your rig’s towing capacity, a Cummins diesel swap opens up a world of possibilities.

Here’s why diesel enthusiasts trust Cummins:

• Proven Reliability: Cummins engines are built tough, designed to perform under heavy loads, extreme conditions, and high mileage. Their reputation for durability is second to none in the diesel community.
• Community Backing: From online forums to swap meetups, the Cummins name commands respect. The vast support network of enthusiasts and professionals means guidance and parts are always within reach.
• Aftermarket Ecosystem: With a massive catalog of performance upgrades, Cummins engines are easy to modify and maintain. Whether you need a full Cummins swap kit or individual components, there’s no shortage of options.

Benefits of a Cummins Engine Swap

Swapping in a Cummins engine isn’t just about replacing a motor—it’s about elevating your vehicle’s capabilities. These engines deliver the performance and adaptability needed for heavy-duty work, off-road play, and everything in between.

Key advantages of a Cummins engine swap include:

• Power-to-Weight Ratio: Engines like the 5.9L 12-valve and 6.7L Cummins pack massive torque without adding excessive bulk. This makes them ideal for both off-road rigs and towing setups.
• Torque: One standout feature of Cummins engines is their impressive torque. According to AutoList, the 6.7L Cummins HO Diesel delivers a hefty 1,075 lb-ft of torque, which outperforms other popular options like the Duramax 6.6L Diesel at 975 lb-ft. This edge in torque makes Cummins engines ideal for heavy-duty applications, such as towing and off-road builds, where every pound of pulling power matters.
• Longevity and Resilience: Built with forged steel crankshafts and high-strength pistons, Cummins engines routinely surpass 500,000 miles with proper maintenance. They’re engineered to withstand the harshest conditions and heaviest loads.
• Versatility Across Builds: From vintage restorations to daily drivers, Cummins engines adapt seamlessly to various vehicle types and applications.
• Breathing New Life Into Classics: Imagine a square body Chevy or vintage Ford truck equipped with the raw power of a Cummins. A swap modernizes these vehicles while preserving their timeless appeal.

Finding the Best Cummins Engine for Your Project

When it comes to picking the right Cummins engine for your project, it’s all about matching the engine’s strengths to your build’s goals. Each Cummins model offers unique benefits, and understanding what they bring to the table will help you make the best choice.

• 5.9L 12-Valve: Renowned for its bulletproof reliability and straightforward design, this engine is a top pick for enthusiasts who prioritize simplicity. Its mechanical injection system makes it a favorite for off-road rigs and classic builds. Plus, it’s easy to tune for added power without sacrificing durability.
• 6.7L Cummins: Modern and mighty, the 6.7L is ideal for heavy-duty applications like towing and high-performance builds. With advanced features like a variable geometry turbo and improved emissions systems, it delivers both power and efficiency. It’s the go-to option for those who need serious torque and the ability to handle long hauls.
• 4BT Cummins: Don’t let its size fool you. The 4BT is a compact powerhouse, perfect for unique swaps like Jeeps, compact trucks, or even vintage builds. Its lightweight design makes it versatile while still packing the torque Cummins is known for.

When sourcing an engine, you’ll need to decide between new, remanufactured, or used options. As we discussed with Motortrend, at Diesel Power Products, we often recommend new or remanufactured crate Cummins engines for their reliability and performance. Models like the 12-valve, 24-valve, Common Rail, and 6.7-liter Cummins are widely available in the aftermarket and come with the assurance of consistent quality.

However, if you’re working within a tighter budget, used engines can be a viable option—but they come with risks. We’ve heard plenty of horror stories about buyers stuck with junk diesel engines, so always inspect used engines thoroughly and work with trusted sellers.

At DPP, we’ve worked with countless builds, and we know how to pair the right Cummins engine with your vehicle’s demands. Whether you’re looking for raw towing power or a lightweight option for a custom project, there’s a Cummins engine for you.

What’s the Right Cummins Swap Kit for Your Build?

A Cummins swap isn’t just about the engine—it’s about making sure every part fits and functions perfectly. That’s where a Cummins swap kit comes into play. These kits are designed to simplify the swap process, saving you time, frustration, and the headache of hunting for compatible parts.

Beyond sourcing the engine, below are just a few of the details you will need to address to make the engine compatible with your retrofit vehicle of choice:

• Transmission Adapters: Ensure seamless compatibility between the Cummins engine and your existing transmission. In most situations you will need the bellhousing adapter, flywheel, and electronics to allow the transmission to communicate with the engine.
• Engine Mounts: Heavy-duty mounts designed to handle Cummins torque without compromising stability, specifically designed to retrofit the inline six int your engine bay
• Cooling System Upgrades: Keep your engine running at optimal temperatures, even under heavy loads.
• Wiring and Electronics: Simplify the integration of sensors, fuel systems, and other critical components.

Choosing the right parts means more time spent building and less time troubleshooting. With DPP’s extensive selection of Cummins parts, you’ll have everything you need to bring your Cummins swap to life.

Make-Specific Cummins Swaps: Tips for Popular Builds

Each vehicle make comes with its own set of challenges and opportunities when it comes to a Cummins swap. From Ford’s Powerstroke replacements to preserving the classic style of a square body Chevy, the right approach depends on the build. Here’s a closer look at popular makes, the best engine choices, and practical tips to tackle each swap with confidence.

Ford Cummins Swap: Turning a Blue Oval into a Diesel Beast

Ford trucks are a prime choice for Cummins swaps, especially for owners frustrated with the reliability of 6.0 and 6.4L Powerstroke engines. Popular models for these upgrades include F-250, F-350, and the iconic OBS (Old Body Style) Ford trucks. Here’s what makes this swap a game-changer:

● Why Swap?
Replacing engines like the 6.0L Powerstroke with a 5.9L Cummins eliminates common issues like injector failures and head gasket problems. Cummins engines offer superior reliability and torque, ideal for towing and heavy-duty use.
● Engine Options:
○ 5.9L 12-Valve Cummins: The go-to choice for simplicity and durability. Ideal for older models or builds needing fewer electronics.
○ 6.7L Cummins: Perfect for those looking for modern performance, variable geometry turbos, and advanced emissions control.
● Recommended Kits:
Look for 6.0 to 5.9 Cummins swap kits that include everything from transmission adapters to motor mounts. Upgrading cooling systems is also critical for heavy towing builds.
● Challenges:
The biggest hurdle in Ford swaps is integrating the transmission and electrical systems. Custom adapters and standalone controllers can simplify this process.

Square Body Chevy Cummins Swap: A Classic Upgrade

There’s something timeless about a square body Chevy truck, and adding a Cummins engine only enhances its appeal. These builds combine retro styling with the raw performance of a diesel workhorse.

● Why Swap?
Square body Chevys are renowned for their rugged design and straightforward mechanics, making them perfect candidates for a 5.9L Cummins swap. Owners often want to preserve the classic aesthetic while modernizing the drivetrain.
● Engine Options:
○ 5.9L Cummins: A classic choice for retaining simplicity and dependability.
○ 6.7L Cummins: Brings more horsepower and advanced features to the table.
● Tips for Success:
Reinforce the chassis to handle the added torque, particularly if you’re opting for a 6.7L Cummins. Pay attention to preserving the original look of the truck, including exhaust routing and engine bay cleanliness.
● Challenges:
Wiring can be tricky in older vehicles. Consider using a dedicated harness designed for square body swaps to avoid electrical headaches.

Dodge 5.9 or 6.7 Cummins Swap: Upgrading Non-Cummins Models

Even Dodge trucks benefit from a Cummins swap. Older models with gas engines or non-Cummins diesels can experience a complete transformation with the right upgrade.

● Why Swap?
Many early Dodge trucks came with gas engines that lacked the torque and durability needed for heavy-duty use. Dropping in a Cummins engine turns these trucks into towing machines with extended lifespan and improved reliability.
● Engine Options:
○ 5.9L Cummins (2nd Gen): A bulletproof choice for Dodge trucks built in the 1990s.
○ 6.7L Cummins (3rd Gen): Ideal for more modern builds looking for better emissions control and horsepower.
● Tips for Success:
Upgrade to heavy-duty axles and drivetrain components to handle the increased torque. Adding a larger radiator or auxiliary cooling system can also improve performance under heavy loads.
● Challenges:
Fuel system upgrades may be necessary, especially if you’re converting from a carbureted gas engine.

Jeep Cummins Swap: Big Power for Smaller Rigs

A Cummins swap isn’t just for full-sized trucks—Jeep Wranglers, Cherokees, and even Gladiators can benefit from a lighter diesel engine like the 4BT Cummins.

● Why Swap?
For off-road enthusiasts, the torque of a Cummins engine transforms a Jeep into a climbing, towing, and trail-dominating beast.
● Engine Options:
○ 4BT Cummins: Compact and lightweight, this engine fits well into smaller engine bays without compromising torque.
○ 6BT Cummins: For those who want extra power and don’t mind modifying the frame.
● Tips for Success:
Reinforce the frame and suspension to handle the added weight and stress. Pairing the Cummins with a manual transmission is common for off-road control.
● Challenges:
Space is always a concern with Jeep swaps. Custom motor mounts and a low-profile oil pan can help optimize fitment.

FAQs: Your Questions About Cummins Swaps Answered

How To Do a Cummins Swap?

A Cummins swap is no small feat, but with the right preparation, it’s entirely achievable for dedicated enthusiasts. Start by thoroughly researching your specific vehicle and understanding its unique requirements. Whether you’re working on a Ford, Chevy, or Dodge, ensure the frame, drivetrain, and suspension can handle the torque and weight of a Cummins engine. Next, source a reliable engine—options like the 5.9L Cummins or 6.7L Cummins are popular for their power and reliability. Finally, invest in a high-quality Cummins swap kit tailored to your build to avoid compatibility issues and streamline the installation process. Kits typically include motor mounts, adapters, and other essentials, making the swap significantly smoother.

How to Cummins Swap a Square Body?

Swapping a Cummins engine into a square body Chevy is a project that marries modern performance with classic aesthetics. Focus first on selecting the right engine, with the 5.9L Cummins being a common choice for its durability and manageable electronics. Engine mounts will likely need to be customized or purchased as part of a dedicated square body Cummins swap kit to ensure proper alignment. Transmission compatibility is another key consideration; adapters may be required to pair the Cummins engine with the existing transmission. Lastly, preserving the truck’s vintage look while accommodating modern upgrades—like routing the exhaust discreetly—ensures the final build stays true to the square body’s timeless appeal.

How Much Does a Cummins Swap Cost?

The cost of a Cummins swap can vary widely depending on factors like the engine choice, the vehicle, and whether you’re handling the installation yourself or hiring a professional. On average, expect to spend $10,000 to $15,000 for a comprehensive swap, which includes the engine, swap kit, and supporting modifications like upgraded cooling and drivetrain components. If you’re upgrading to a newer 6.7L Cummins, costs may climb higher due to added complexity. Labor can add a significant chunk to the budget—shop rates for swaps typically range from $90 to $150 per hour, so DIY efforts can save thousands if you have the tools and expertise.

Are Cummins Swap Kits Universal?

Cummins swap kits are not universal; they’re specifically designed for certain makes and models to ensure a seamless fit and proper functionality. A well-designed swap kit typically includes engine mounts, transmission adapters, and supporting hardware tailored to a specific combination of vehicle and engine. For instance, a Ford Cummins swap kit will have different components than one for a square body Chevy or a Dodge. Using a vehicle-specific kit eliminates much of the trial and error involved in custom fabrication, saving time and ensuring your build performs as expected. Always double-check compatibility before purchasing to avoid costly mistakes.

Essential Maintenance for Your Swapped Cummins Engine

Completing your Cummins swap is only the first step; keeping your engine in top shape requires consistent maintenance. Regular oil changes are crucial—using high-quality diesel oils, like those offered at Diesel Power Products, ensures your engine stays lubricated under heavy loads and high temperatures.

Don’t overlook filter replacements, including fuel, air, and oil filters, as they protect your engine from harmful debris and contaminants. Routine inspections of critical components like the turbocharger, cooling system, and drivetrain are also essential, especially if your swapped rig sees heavy-duty use.

Whether you’re running a 5.9L Cummins or a 6.7L Cummins, maintaining optimal performance means staying ahead of potential issues. At DPP, we offer a full range of maintenance products tailored specifically for Cummins engines, ensuring your build runs reliably for years to come.

Ready to Start Your Cummins Swap?

Whether it’s a Ford, Chevy, Dodge, or a custom build, a Cummins swap transforms your vehicle into a powerhouse tailored to your needs. At Diesel Power Products, we offer the parts and expertise to make your swap seamless and successful. Explore our selection of Cummins parts today and turn your vision into reality. The road ahead is yours to build.