Cummins Swap: Duramax-Powered Chevy Silverado

Duramax-Powered Cummins Swap

In the diesel industry, Cummins swaps are nothing new. The B series inline-six has been the engine of choice for sled pullers, drag racers, rat rods, and (of course) Ford trucks for more than a decade. However, the unwritten rules of engagement in performing a Cummins swap dictate that Duramax-powered trucks are off-limits. With common-rail injection and a proven track record for performance and durability, the 6.6L V8 is more than sufficient in yielding the kind of power most enthusiasts are after. Put simply: you just don’t go there.

“THE CHEVY GUYS GET A LITTLE UPSET, BUT THE DODGE GUYS LOVE IT.”

But then there are young guns like Tyler Rabbage. The 22-year-old Miami native wasn’t afraid to break all the rules in pursuit of adding reliability and horsepower to his ’03 Silverado. After the LB7’s second set of injectors began to go south and its 350,000-mile head gaskets appeared blown, Tyler got to thinking. “I had the choice to either fix the issues with the Duramax or—for the same price—I could put a Cummins in the truck and make more power,” he told us.

And so, the “Chummins,” as Tyler and his group of friends like to refer to it, was born. Perhaps the wildest part of the entire process was how quickly it all unfolded. Tyler spent his 2016 college Spring Break performing the Cummins swap. In just eight days—and with the help of Outlaw Diesel in Miami—the Duramax/Allison combination was ditched in favor of a compound turbo’d, 12-valve Cummins backed by a built 47RH.

LOW-MILE 12-VALVE

Sourced from Craigslist, the 120,000-mile 12-valve 5.9L was gone through by Tyler and Felix Aleman of Outlaw Diesel in Miami. While the bottom end was left alone, Tyler knew some provisions would have to be made for the head gasket to live at the boost he wanted to run. So, the cylinder head was pulled and sent to Haisley Machine for fire-rings and one of its standard thickness fire-ring gasket kits. Before the head was reinstalled, it was treated to a full port and polish at Outlaw Diesel in Miami, along with 90-ppi valve springs to lower the possibility of valve float or creep. ARP head studs clamp the worked over head to the block. The engine itself rides on factory Dodge/Cummins motor mounts welded to the GM’s frame and, believe it or not, the 5.9L fits better in the Chevy engine bay than it does in a Ram’s. “There’s a lot more room between the rear valve cover and the firewall in the Chevy,” Tyler told us. “The hardest part of the whole swap was actually getting the A/C lines made, as we couldn’t do that ourselves.”

“THE UNWRITTEN RULES OF ENGAGEMENT IN PERFORMING A CUMMINS SWAP DICTATE THAT DURAMAXPOWERED TRUCKS ARE OFF LIMITS.”

PUMP WORK

The fact that the engine was plucked from a ’96 model year Ram with an NV4500 meant it had the highly sought after 215hp P-pump. Along with the normal tweaks (custom fuel plate and AFC adjusted completely forward), the pump benefits from full-cut delivery valves and its timing being set at an aggressive 21 degrees of advancement. The injectors are stock for now—although as we went to press Tyler had a set of 5×18 units from Diesel Auto Power on the way.

BIG BOOST

Pegging the 60-psi boost gauge in the cab comes courtesy of an HX35 over S400 compound turbo arrangement. The BorgWarner S475 is internally wastegated, features a T6 flange, and is supported via a bracket bolted to the passenger side motor mount. The tough-as-nails nature of the factory Holset HX35 got the nod for the manifold charger and produces the lion’s share of boost the engine sees. The downpipe and all intercooler tubes were fabricated by Outlaw Diesel in Miami, while the factory Duramax intercooler was reused.

AXING THE ALLISON

To keep the swap simple (and namely void of electronics), Tyler chose to do away with the five-speed Allison. Instead, the torquey 12-valve is backed by a 47RH four-speed automatic, which (ironically enough) was sourced from the same person that sold him the truck years prior. In order for the 47RH to live behind the Cummins, Tyler once again turned to Outlaw Diesel in Miami for a helping hand. The slushbox was torn down and reinforced with a billet input shaft, a triple disc torque converter from SunCoast, and a performance valvebody fitted with TransGo parts.

So what’s it like driving a Cummins-powered ¾-ton Silverado? As you can imagine, Tyler gets the full gamut when it comes to reactions. Comments like “you ruined the truck!” or questions such as “how could you put a Cummins in a Chevy?” come his way on a regular basis. But while the truck seems to ruffle plenty of feathers in the bow tie crowd, Dodge guys and Cummins diehards love the swap. No matter what side of the fence people are on, it gets them talking—and that’s exactly what Tyler wanted. He gets the unmatched reliability of the 12-valve Cummins wrapped in a Chevy body, and the satisfaction of his creation turning heads wherever it goes.

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FREQUENTLY ASKED QUESTIONS

 

What legal issues might arise from swapping an older engine into a newer vehicle?

Swapping an older engine into a newer vehicle can be an exciting project for car enthusiasts, but it does come with a host of potential legal issues that need careful consideration.

Emissions Compliance

One of the primary concerns is emissions compliance. Many regions have strict emissions standards that vehicles must meet, especially newer models. Installing an older engine that doesn’t comply with current emissions standards could lead to your vehicle failing emissions tests. This could make it illegal to drive on public roads, potentially resulting in fines and mandates to revert the modifications.

Safety Standards

Another aspect is safety standards. Newer vehicles are built with advanced safety features controlled electronically. Integrating an older engine may disrupt these systems, potentially violating safety regulations. This not only affects the legality but also the safety of the vehicle in case of an accident.

Insurance Implications

Don’t overlook insurance implications. Modifying your vehicle in such a substantial way can affect insurance coverage. Failure to notify your insurer about the engine swap might lead to a denial of claims if the vehicle is involved in an accident.

Warranty Issues

If the newer vehicle is still under warranty, an engine swap may void the warranty. This could result in out-of-pocket costs for repairs unrelated to the engine if issues arise down the line.

VIN Regulations

Additionally, some jurisdictions have strict rules concerning Vehicle Identification Number (VIN) regulations. Changing the engine might require updating the VIN records, and failure to do so can result in legal penalties.

Navigating the Legal Landscape

It’s crucial to consult with a professional mechanic and legal advisor familiar with automotive law before proceeding with such modifications. They can guide you on how to comply with all legal standards and ensure that your project doesn’t lead to unforeseen legal troubles.

In summary, while installing an older engine into a newer vehicle can enhance performance or achieve a specific look, it’s essential to address the associated legal challenges upfront. Doing so ensures your automotive project is both enjoyable and lawful.

 

What are the considerations for swapping a Duramax engine with a Cummins engine in a vehicle?

Considerations for Swapping a Duramax Engine with a CumminsEngine

Swapping a Duramax engine with a Cummins engine in your vehicle can be a rewarding but complex project. Here are the key considerations to keep in mind:

Compatibility and Legal Compliance

1. Model Year Compatibility: Ensure the replacement engine matches the vehicle’s model year to comply with emissions regulations. Swapping an older engine into a newer vehicle can result in legal issues due to differing emissions standards.
2. Mechanical vs. Electronic Systems: Newer vehicles often house more sophisticated electronic systems. Ensure that the engine swap accommodates these electronic controls, or else you might face integration issues.

Technical Modifications

1. Adapter Plates: Utilize custom adapter plates, such as those offered by companies like Destroked, to connect the new engine to your existing transmission. This is particularly critical for ensuring compatibility with transmissions such as the Allison 1000.
2. Motor Mounts: Custom motor mounts will be necessary to secure the Cummins engine properly in place of the original Duramax.
3. Driveshaft Modifications: You may need to modify the driveshaft – either shortening or lengthening it – to ensure a proper fit.
4. Exhaust and Cooling Systems: Consider changes to exhaust routing and cooling systems. Decide between a mechanical or electric fan to suit the new engine’s requirements.

Electronic and Fuel System Adjustments

1. ECM and Gauges: Integrating the engine control module (ECM) and ensuring compatibility with the vehicle’s existing gauge cluster is vital. Some systems may require custom wiring or additional modules to function correctly.
2. Lift Pump Installation: Installing a lift pump can be necessary to maintain adequate fuel pressure and delivery, especially if the new engine demands different specifications.

Budget and Resources

1. Cost: Factor in not just the cost of the engine, but also the expenses for modifications, custom parts, and professional assistance if needed.
2. Time and Expertise: Assess your mechanical skills and available time. A project of this magnitude can be time-consuming and requires precise technical expertise.

Completing this swap will certainly create a unique and attention-grabbing vehicle. However, thorough planning and consideration of all technical, legal, and budgetary aspects are crucial to a successful engine swap.

 

What are the advantages and disadvantages of choosing a 24-valve 5.9 Cummins engine for the swap?

Advantages and Disadvantages of Choosing a 24-Valve 5.9 Cummins Engine for the Swap

When considering a 24-valve 5.9 Cummins engine for a swap, it’s essential to weigh both the pros and cons to make an informed decision. Here’s a comprehensive breakdown:

Advantages

• Performance and Power: The 24-valve 5.9 Cummins engine is renowned for its robust power and torque. It can handle heavy loads, making it an excellent choice for those seeking high performance in towing or hauling.
• Fuel Efficiency: Compared to other diesel engines, this engine is often more efficient, providing better mileage, which can be a significant advantage for long-distance drivers or those concerned with fuel economy.
• Durability and Longevity: Known for its reliability, the 5.9 Cummins can clock up impressive mileage if well-maintained. Its build quality is such that it withstands the test of time, offering peace of mind to users.
• Aftermarket Support: There’s a vast range of aftermarket parts available, so customization and enhancements are readily accessible. This can be particularly appealing for those looking to tweak performance to their liking.

Disadvantages

• Complex Wiring: Unlike older models such as the 12-valve, the 24-valve version requires more sophisticated wiring. This complexity can lead to increased labor costs and time during installation.
• Potential for Issues: Earlier models of the 24-valve may experience issues such as injection pump failures. Addressing these problems can be costly and inconvenient.
• Noise and Vibration: Diesel engines, including the 5.9 Cummins, tend to be noisier and have more vibration compared to gasoline engines, which might not appeal to everyone, especially in a vehicle primarily used for casual driving.
• Weight: The engine is also quite heavy, which may affect the overall weight balance of the vehicle, impacting handling and suspension.

Conclusion

Choosing a 24-valve 5.9 Cummins engine involves balancing its robust power and efficiency against the potential complexities and downsides of installation and maintenance. It’s a powerhouse suitable for those who value performance and durability, provided they’re prepared for the technicalities involved in the swap.

 

What are some alternative modifications that can be done to a Duramax engine to improve performance without a full engine swap?

When looking to boost the performance of a Duramax engine without committing to a full engine swap, there are several alternative modifications you might consider.

1. Upgrade the Turbocharger

One effective modification is upgrading to a Variable Geometry Turbocharger (VGT). This enhances performance by providing better boost control compared to stock options. Consider brands like BorgWarner or Garrett for high-quality upgrades.

2. High-Performance Injectors

To ensure more efficient combustion and increase horsepower, high-performance injectors are a smart choice. Brands like Bosch and Industrial Injection offer reliable replacements that can improve your engine’s performance without the hassle of frequent maintenance.

3. Head Upgrades

Swapping out the factory cylinder heads for high-performance ones can result in better airflow and cooling. Consider investing in ported or aftermarket heads, such as those from AFR or Edelbrock, to optimize engine efficiency.

4. Exhaust System Enhancements

Improving the exhaust system by removing unnecessary restrictions can lead to significant gains. A turbo-back exhaust system, minus emissions control components like the EGR or catalytic converter, can increase both power and efficiency (ensure local emissions regulations are followed).

5. Air Intake Systems

Upgrading to a high-flow air intake system can also enhance your engine’s performance, delivering more oxygen for combustion. Look for options from companies like AEM or AFE Power, which are known for high-quality components.

By focusing on these key areas, you can enhance your Duramax engine’s performance efficiently and effectively, all without resorting to a full engine swap.

 

What components and modifications are necessary to make the engine swap successful, such as adapting the gauges, ECM, lift pump, and fan type?

An adjustable fuel pressure regulator from VMS Racing keeps a steady diet of diesel on tap for the P-pump. While opinions continue to vary as to what the ideal pressure to send the P-pump’s way is, Tyler keeps the regulator locked in at 50 psi. Providing great bottom end response is a Holset HX35, which when combined with the S475 easily pegs the 60-psi boost gauge on the A-pillar. Two 50mm Tial blow-off valves are incorporated between stages in the charge pipe. Boosted air routes through the truck’s original (Duramax-intended) intercooler. Being a ’96 model year Cummins, it came with the highly desirable 215hp version of the Bosch P7100. Courtesy of Outlaw Diesel in Miami, the 12mm P-pump benefits from a set of full-cut delivery valves, a custom fuel plate, its AFC being adjusted all the way forward, and a healthy 21-degrees of timing.

Fitting for a rare, Cummins-swapped Silverado HD is a set of wheels we seldom see: 16×9-inch Granite Alloys wrapped in Nitto Trail Grappler M/T tread measuring 285/75R16. With a desire to keep things simple, Tylerscrapped the five-speed Allison 1000 in favor of a 47RH. The four-speed automatic sports a triple disc torque converter from SunCoast, a billet input shaft, and an Outlaw Diesel in Miami-built valve body with TransGo internals.

In order to make the 47RH work (and because the 5.9L moved the transmission back much further within the truck), the rear drive shaft had to be shortened. On the low-pressure supply side of things, Tyler left nothing to chance. The P-pump is well-fed thanks to a Bean’s Diesel Performance sump installed in the factory GM tank and this 200-gph AirDog II system, which is said to be capable of supporting 1,000hp. Make no mistake, the three-ball hitch in the receiver sees its fair share of work, as Tyler uses the truck to tow on occasion. He told us the Silverado gets roughly 11 mpg with a trailer attached, but typically sees 20 mpg when empty. It only made sense to retain the burly 11.5-inch ring gear AAM 1150 the Chevy came with, which still utilizes the factory 3.73 ring and pinion. As for the exhaust, it’s made up of a 5-inch diameter, aluminized, over axle system from Flo-Pro that was designed for a Duramax but adapted to work with the Cummins’ downpipe. Tyler topped things off with a 10-inch polished tip.

For anyone considering a similar engine swap, several components and modifications are essential to ensure success:

• Billet Adapter: Required to mate the engine to the Allison 1000 transmission, a common feature in many trucks.
• Cluster Gauges: To ensure these function correctly, integrating or adapting an ECM may be necessary.
• Fuel Delivery System: A lift pump, like the AirDog II, is crucial to maintain adequate fuel pressure.
• Cooling System: Decide between a mechanical or electric fan based on your setup needs.
• Motor Mounts: Fabrication will be necessary to secure the new engine.
• Driveshaft Modifications: Depending on the engine placement, shortening or lengthening the driveshaft may be required.

These modifications, alongside the performance enhancements already discussed, create a robust and reliable engine setup capable of handling various driving demands.

 

Are there any known specialists or places that perform Cummins swaps into other vehicle brands?

In just eight days—and with the help of Outlaw Diesel in Miami—the Duramax/Allison combination was ditched in favor of a compound turbo’d, 12-valve Cummins backed by a built 47RH. This transformation is not just a one-off; there are specialists around the country dedicated to such swaps.

For instance, there are reports of a place in Montana that specializes in swapping Cummins engines into GM vehicles. While the exact name and location remain elusive, it’s clear that enthusiasts across the nation can find experts to bring their diesel dreams to life. This community of dedicated shops ensures that whether you’re in Miamior Montana, turning your GM vehicle into a Cummins-powered powerhouse is more than possible.

 

What modifications can be done to a Silverado’s existing engine to increase horsepower?

Enhancing the Horsepower of a Silverado Engine

If you’re looking to boost the horsepower of your Silverado’s engine, you’re in luck. There are several modifications that can take your truck’s performance to the next level. Here’s a comprehensive guide to potential upgrades:

1. Custom Tunes and ECU Reprogramming

• Custom ECU Tune:Reprogramming the Engine Control Unit (ECU) allows for tailored adjustments to fuel injection, ignition timing, and back pressure. This can lead to significant horsepower boosts. Look for well-reviewed aftermarket tuners specializing in your truck’s model.
• EFI Live Tuning:This advanced tuning software provides precise control over the vehicle’s performance parameters and can unlock additional horsepower when customized by a professional.

2. Performance Air Intake Systems

• Cold Air Intakes (CAI):Upgrading to a high-performance cold air intake improves airflow to the engine. This, in turn, can lead to better combustion and an increase in horsepower.

3. Exhaust System Enhancements

• High-Flow Exhaust:Consider a performance exhaust system that reduces back pressure and allows for better expulsion of exhaust gases. This not only increases horsepower but also improves engine sound.
• Headers:Replacing the stock headers with performance headers can improve exhaust flow, further enhancing engine efficiency and power.

4. Cylinder Head Work

• Upgraded Cylinder Heads:If your Silverado already has some head work done, you can further enhance it with porting and polishing. This modification increases airflow, resulting in more power.

5. Camshaft Upgrade

• Performance Camshaft:A higher-performance camshaft can significantly affect engine dynamics by improving airflow and increasing power output.

6. Gear Changes

• Adjusting Gear Ratios:Changing to a higher gear ratio, such as moving to 4.88 gears, can improve torque and boost overall power output.

7. Forced Induction

• Supercharger or Turbocharger:Adding a supercharger or turbocharger is one of the most effective ways to significantly boost horsepower. These systems force more air into the engine, allowing for more fuel to be burned, which translates into more power.

8. Fuel System Improvements

• Upgraded Fuel Injectors and Pump:Installing higher-capacity fuel injectors and a high-performance fuel pump ensures your engine receives the optimal amount of fuel for combustion, leading to horsepower gains.

These modifications, whether done individually or collectively, can transform the performance of your Silverado engine, making it a high-performance beast on the road. Just remember, it’s crucial to consult with a performance specialist to ensure compatibility and to achieve the best results for your specific model.

 

What considerations should be made regarding engine weight and vehicle use in a swap?

When considering an engine swap, it’s crucial to evaluate engine weight and your intended vehicle use. Here’s a breakdown of key factors to keep in mind:

Engine Weight

1. Impact on Suspension: A heavier engine can significantly alter your vehicle’s suspension dynamics. The additional weight might require upgrades to your suspension system to maintain ride quality, handling, and safety.
2. Chassis Limitations: Ensure that your vehicle’s chassis can accommodate and support the increased weight. Exceeding the designed weight capacity could compromise structural integrity.
3. Balance and Distribution: Consider how the weight distribution affects the vehicle’s overall balance. Poor weight distribution can lead to handling issues, especially in lifted or modified vehicles.

Vehicle Use

1. Performance Goals: Define your performance objectives clearly. If you’re aiming for increased horsepower without extreme modifications, focus on engine options that meet your power needs efficiently.
2. Driving Conditions: Assess how you’ll typically use the vehicle—whether it’s for off-roading, daily commuting, or towing. Each application may have different requirements for engine power, torque, and durability.
3. Transmission Compatibility: Choose an engine that pairs well with a transmission that suits your driving style and requirements. You might need to consider a manual transmission if you desire more hands-on control.

Additional Considerations

• Lift Modifications: Ensure your lift adjustments do not negatively impact your center of gravity or vehicle stability, particularly if you’re avoiding extreme height changes.
• Budget and Resources: Factor in the costs associated with additional modifications and potential reinforcement needs for increased weight and power.

Taking these considerations into account will help ensure a successful engine swap that enhances your vehicle’s performance and meets your specific needs.

 

Why might someone choose a Cummins 4BTA engine for their vehicle project?

Why Choose a Cummins 4BTA Engine for Your Vehicle Project?

When considering an engine swap for your vehicle project, the Cummins 4BTA often stands out as a top contender. This lightweight, yet powerful diesel engine has several qualities that make it an attractive option for both off-road enthusiasts and those looking for a reliable daily driver.

Fuel Efficiency and Cost-Effectiveness

One of the most significant advantages of the Cummins 4BTA is its exceptional fuel efficiency. Known for its mileage capabilities, this engine can save you money in the long run, especially as fuel prices continue to fluctuate. Additionally, for those embarking on long hunting trips or venturing into remote areas, the engine’s fuel economy can be a serious boon.

Durability and Longevity

The Cummins 4BTA is renowned for its durability and longevity. With engines easily surpassing the 250,000-mile mark, it’s built to withstand the rigors of heavy usage, making it ideal for projects where reliability is crucial. Its robust design makes it suitable for challenging terrains, whether you’re slogging through mud during a hunting excursion or hauling heavy loads.

Versatility and Adaptability

This engine boasts a compact size relative to its power output, offering more flexibility in terms of vehicle compatibility. It’s particularly suited for projects involving older trucks or off-road builds, where space and weight are a concern. Its adaptability is further enhanced by the availability of aftermarket wiring harness adapters, simplifying the installation process.

Customization Potential

For those who love a custom build, the 4BTA offers plenty of opportunities. While extensive customization may be needed, especially if you’re pairing it with different transmissions or chassis, the end result can be uniquely tailored to your specific needs and preferences.

Cost and Accessibility

While the initial investment might seem high, the long-term benefits often outweigh the upfront costs. Additionally, the wide availability of parts and the engine’s compatibility with different vehicles make the Cummins 4BTA a practical choice for many DIY enthusiasts.

In summary, whether your project requires the reliability of a daily driver or the robustness for off-road adventures, the Cummins 4BTA engine provides an excellent foundation. Its combination of fuel efficiency, durability, and customization potential makes it a popular choice for vehicle projects.

 

How do the Fummins conversion and a Silverado swap differ?

When considering a Fummins conversion versus a Silverado swap, it’s essential to understand their distinct differences in terms of engines and compatibility.

Engine Quality and Performance

Fummins Conversion:

• This involves installing a Cummins diesel engine into a Ford truck. Cummins engines are renowned for their durability and torque, making them a popular choice for those seeking robust performance for heavy-duty applications.

Silverado Swap:

• Typically involves replacing a Silverado’s factory engine with an LS engine from General Motors. LS engines are celebrated for their versatility, power, and efficiency, making them a favorite for performance enthusiasts and those seeking improved horsepower.

Compatibility and Installation

Fummins Conversion:

• This swap may require extensive modifications to integrate the Cummins’ engine with the Ford’s framework and systems, which can be complex and time-consuming.

Silverado Swap:

• Generally seen as more straightforward, especially when swapping within the GM family. The modular nature of LS engines allows for smoother integration with Silverado trucks.

Performance Goals

• Torque and Towing:If your priority is torque for towing and hauling, a Fummins conversion might be your best bet due to the strength of the Cummins engine.
• Speed and Horsepower:On the other hand, if you’re focused on speed and overall horsepower, an LS swap in a Silverado is often more appealing.

Cost and Resources

• Fummins Conversion:Can be more expensive due to the complexity of the modifications needed.
• Silverado Swap:Typically more cost-effective, given the broad availability of LS engines and swap kits.

In summary, the choice between a Fummins conversion and a Silverado swap depends on your specific needs and preferences regarding performance, ease of installation, and budget.

 

How can the experience of others who have completed similar swaps inform your project decisions?

“Tyler gets the full gamut when it comes to reactions. Comments like ‘you ruined the truck!’ or questions such as ‘how could you put a Cummins in a Chevy?’ come his way on a regular basis. But while the truck seems to ruffle plenty of feathers in the bow tie crowd, Dodge guys and Cummins diehards love the swap. No matter what side of the fence people are on, it gets them talking—and that’s exactly what Tyler wanted.”

Learning from the Journey of Others

For those considering a similar swap, insights from others who have embarked on this journey can be invaluable. One enthusiast shared how having the right tools, like a welder, and a donor vehicle made the process manageable. It’s not just about the resources, though; having the expertise or willingness to learn is crucial.

• Budgeting Tips: Although it might seem daunting, the costs can be kept in check if you already own some of the necessary equipment. This practical perspective helps in planning and preparing financially.
• Technical Know-How: Acquiring the skill set to handle such a project can be rewarding. Enthusiasts often highlight the importance of understanding the mechanics involved, which can save time and reduce frustration.

Ultimately, Tyler’s experience and the stories from other swap aficionados highlight the blend of creativity, skill, and community dialogue that makes such projects fulfilling.

 

What are some challenges or concerns associated with engine swaps in trucks?

Tyler knew some provisions would have to be made for the head gasket to live at the boost he wanted to run. So, the cylinder head was pulled and sent to Haisley Machine for fire-rings and one of its standard thickness fire-ring gasket kits. Before the head was reinstalled, it was treated to a full port and polish at Outlaw Diesel in Miami, along with 90-ppi valve springs to lower the possibility of valve float or creep. ARP head studs clamp the worked over head to the block. The engine itself rides on factory Dodge/Cummins motor mounts welded to the GM’s frame and, believe it or not, the 5.9L fits better in the Chevy engine bay than it does in a Ram’s. “There’s a lot more room between the rear valve cover and the firewall in the Chevy,” Tyler told us. “The hardest part of the whole swap was actually getting the A/C lines made, as we couldn’t do that ourselves.”

But beyond the technical modifications, several practical concerns arise with such an ambitious engine swap. One significant consideration is whether the truck can still serve as a daily driver post-swap. With fuel prices climbing, the swap might turn the vehicle into a more economical option for everyday use—especially with the promise of better mileage from the new engine.

Weight and Handling
Weight plays a crucial role in vehicle dynamics, and Tyler is mindful of how the swap could affect the truck’s handling and performance. Ensuring that the new engine doesn’t upset the balance is vital for both safety and functionality.

Engine Longevity
With the current engine nearing the end of its life at 250K miles, the swap isn’t just about performance—it’s a preemptive measure to avoid future breakdowns. Tyler’s focus on longevity shows a strategic approach to the investment.

Customization and Costs
While wiring isn’t a significant hurdle due to the availability of harness adapters, the level of customization required is substantial. Tyler acknowledges that costs can escalate quickly, but his dedication to getting every detail right underscores the importance of planning and budgeting for such a project.

In undertaking this swap, Tyler is not merely enhancing power but also addressing essential concerns that could make or break the practicality of his truck for real-world use.

 

What are the different engine and transmission options for swapping into a Silverado?

“Tyler chose to do away with the five-speed Allison. Instead, the torquey 12-valve is backed by a 47RH four-speed automatic, which (ironically enough) was sourced from the same person that sold him the truck years prior. In order for the 47RH to live behind the Cummins, Tyler once again turned to Outlaw Diesel in Miami for a helping hand. The slushbox was torn down and reinforced with a billet input shaft, a triple disc torque converter from SunCoast, and a performance valvebody fitted with TransGo parts.”

When considering engine and transmission swaps for a Silverado, enthusiasts have several compelling options. Each combination offers unique advantages, allowing for customization based on power needs and driving preferences.

Popular Engine and Transmission Pairings:

1. Cummins 4BTA with NV4500 Transmission
   This setup is a favorite among those seeking reliability and fuel efficiency. The NV4500, a robust manual transmission, perfectly complements the 4BTA’s legendary durability.
2. Cummins Common Rail with Dodge 6-Speed Transmission
   For those craving modern performance and smooth operation, this pairing delivers. The Common Rail system provides excellent fuel atomization, while the 6-speed offers precise gear shifts.
3. Silverado 6.2/6.0 with ZF6 Transmission
   Chevrolet enthusiasts looking for a balance of power and tradition often choose this pairing. The ZF6’s heavy-duty capabilities make it ideal for handling the Silverado’s V8 prowess.

Each of these combinations presents its own set of installation challenges and benefits, making it essential to weigh your priorities, whether they be power output, fuel efficiency, or ease of integration.

 

What are the cost implications of performing an engine swap in a Silverado?

“After the LB7’s second set of injectors began to go south and its 350,000-mile head gaskets appeared blown, Tylergot to thinking. ‘I had the choice to either fix the issues with the Duramax or—for the same price—I could put a Cummins in the truck and make more power,’ he told us.”

Tyler’s contemplation wasn’t just about performance; it was a financial decision too. The cost of an engine swap can be daunting, but Tyler estimated the conversion would run between $5,000 and $6,000, fully built. He noted that even if expenses climbed to $10,000, it would be a worthy investment compared to selling his Silverado and purchasing another truck.

The decision wasn’t just about economics. It was a project—an opportunity to create something unique. Tylercompared his plan to the popular Fummins conversions seen in the Ford Super Duty community, realizing that, while challenging, it wasn’t an insurmountable task. The growing megatruck community has shown that such custom builds are achievable and rewarding.

Ultimately, Tyler saw the engine swap as more than just a repair; it was a chance to enhance his vehicle’s capabilities and join a thriving community of like-minded enthusiasts.

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