What is the max towing capacity of the 6.7L Cummins High-Output?

You settle into the seat, turn the key, and the 6.7L Cummins fires up with that distinctive diesel clatter—a sound that means business. For a moment, you just listen, knowing that under the hood sits one of the most capable engines ever put in a pickup truck, ready to move mountains.

TL;DR

The 6.7L Cummins High-Output diesel engine represents the pinnacle of heavy-duty pickup power for 2026. Available in both Ram 2500 and 3500 models, this turbo-diesel inline-six cranks out 430 horsepower and a staggering 1,075 lb-ft of torque . But the big story is what it can pull. In the Ram 2500, properly equipped models tow up to 20,000 pounds . Move up to the Ram 3500 with dual rear wheels, and that number jumps to an astonishing 36,610 pounds with a fifth-wheel or gooseneck hitch . This breakdown explains how the engine achieves these figures, what configurations affect towing capacity, and the technology that makes managing all that weight easier than ever.

Key Takeaways

The 2026 6.7L Cummins High-Output diesel delivers 430 hp and 1,075 lb-ft of torque, making it the most powerful diesel Ram has ever offered in a heavy-duty pickup
Ram 2500 towing capacity with this engine maxes out at 20,000 pounds when properly equipped
Ram 3500 towing capacity reaches 36,610 pounds with the High-Output Cummins and dual rear wheels
The new TorqueFlite HD eight-speed automatic transmission replaces the old six-speed, optimizing power delivery and efficiency
Payload capacity varies significantly: the diesel 2500 handles up to 3,600 pounds, while the diesel 3500 can manage up to 6,050 pounds
A largest-in-class 50-gallon fuel tank on Crew Cab models with the 8-foot bed means fewer stops on long hauls
Advanced towing tech like Trailer Reverse Steering Control, 360° camera systems, and Trailer Tire Pressure Monitoring make heavy towing manageable

Table of Contents

The Heart of the Hauler: Inside the 6.7L High-Output Cummins

Here’s the thing about the 6.7L Cummins—it’s been the backbone of Ram’s heavy-duty lineup for years, but the 2026 version represents a significant leap forward. Engineers didn’t just tweak a few components; they reworked the engine from the ground up to deliver 430 horsepower at 2,800 rpm and 1,075 lb-ft of torque at just 1,800 rpm . That torque arriving so low in the rpm range means the engine pulls like a freight train right off idle, which is exactly what you want when you’re trying to get a heavy load moving.

The engine features a high-pressure fuel system, a new turbocharger design, and strengthened internal components to handle the increased cylinder pressures . This is the same basic architecture that’s proven itself in millions of miles of real-world use, but refined to deliver more power with better efficiency.

The new TorqueFlite HD eight-speed automatic transmission from ZF mates perfectly to the Cummins . This isn’t just about having more gears—it’s about keeping the engine in its sweet spot. The transmission defaults to starting in second gear when you’re running empty to save fuel, but instantly shifts to first when it detects a heavy load or a connected trailer. The result is smoother acceleration, better fuel economy, and less hunting for the right gear on grades.

What other engine has the durability reputation to handle extreme towing for decades while still being refined enough for daily driving?

The Numbers That Matter: Torque and Horsepower

Torque is what moves heavy loads, and the 6.7L Cummins has it in spades. The 1,075 lb-ft of torque represents best-in-class base diesel torque . That twisting force is what lets you accelerate up highway on-ramps with a 20,000-pound trailer behind you without breaking a sweat.

Horsepower, at 430, is what keeps you moving at highway speeds and helps maintain momentum on long grades. The combination means this engine isn’t just a grunt specialist—it’s a well-rounded performer that makes towing less stressful regardless of the situation.

Towing Capacity by Model: 2500 vs. 3500

The same engine delivers vastly different towing numbers depending on which truck it’s bolted into. Understanding these differences is crucial to choosing the right truck for your needs.

Ram 2500 Towing Capacity

The Ram 2500 equipped with the High-Output 6.7L Cummins offers:

Maximum conventional towing: Up to 20,000 pounds
Maximum payload: Up to 3,600 pounds with the diesel
Gross Vehicle Weight Rating (GVWR): 11,040 pounds

These numbers mean the 2500 can handle large travel trailers, substantial horse floats, heavy equipment trailers, and most recreational towing needs with authority. The 3,600-pound payload means you can load the bed with tools, materials, or a slide-in camper and still have capacity to spare.

The 2500 achieves these figures with its five-link coil spring rear suspension, which provides a much smoother ride when the truck is empty compared to leaf springs . This makes the 2500 an excellent choice for those who use their truck as a daily driver but need serious towing capability on weekends.

It’s worth noting that the published figures from Ram’s official capability pages show 20,000 pounds , while third-party specs on specific configurations may show lower numbers like 15,710 or 18,230 pounds . This variation reflects differences in cab configuration, bed length, and optional equipment. Always check the specific towing guide for your exact configuration.

Ram 3500 Towing Capacity

The Ram 3500 with the High-Output Cummins and dual rear wheels enters a whole different league:

Maximum fifth-wheel/gooseneck towing: Up to 36,610 pounds
Maximum conventional towing: Approximately 23,000 pounds
Maximum diesel payload: Up to 6,050 pounds
Gross Vehicle Weight Rating (GVWR): Up to 14,000 pounds

That 36,610-pound figure is achieved with fifth-wheel or gooseneck hitches, which place the weight directly over the rear axle for maximum stability . Conventional towing with a standard hitch still reaches an impressive 23,000 pounds. These numbers put the Ram 3500 in a class where it competes with medium-duty trucks, yet it remains a daily-drivable pickup.

The 3500 achieves these numbers through its Hotchkiss leaf spring rear suspension, which provides the stability and support needed for extreme loads . The available dual rear wheels (DRW) configuration adds stability and increases the contact patch for better handling under load.

When your trailer weighs as much as a house, the 3500 is the only logical choice.

Towing Capacity Comparison Table

Configuration	Max Towing (Conventional)	Max Towing (Fifth-Wheel)	Max Payload	GVWR
Ram 2500 Cummins	20,000 lbs	Not applicable	3,600 lbs	11,040 lbs
Ram 3500 SRW Cummins	~23,000 lbs	~30,000 lbs	~4,500 lbs	~12,300 lbs
Ram 3500 DRW Cummins	~23,000 lbs	36,610 lbs	6,050 lbs	14,000 lbs

Fuel Capacity: Going the Distance

When you’re towing heavy, fuel stops become a major consideration. The 2026 Ram Heavy Duty trucks address this with a largest-in-class available 50-gallon fuel tank on Crew Cab models with the 8-foot bed .

This is a massive advantage over competitors. The Ford F-250 and F-350 offer a 48-gallon tank, while the Chevrolet Silverado HD makes do with only 36 gallons . That’s up to 14 extra gallons of fuel in the Ram.

With diesel fuel economy typically ranging from 12-15 mpg while towing, that 50-gallon tank gives you a range of 600-750 miles between fill-ups. You can cross entire states without stopping for fuel, which saves time and reduces the hassle on long hauls. For commercial operators, this means more time working and less time hunting for fuel stations.

Imagine driving from New York to Chicago without stopping for diesel—that’s what this fuel tank enables.

Technology That Makes Towing Easier

Raw power is only part of the story. The 2026 Ram Heavy Duty trucks are loaded with technology that genuinely makes towing easier, safer, and less stressful.

Trailer Reverse Steering Control

This system takes the stress out of backing a trailer. A small knob on the dashboard lets you control the direction you want the trailer to go . Turn the knob left, and the trailer goes left—the truck handles all the steering corrections automatically. It eliminates the frustrating learning curve of backing a trailer and makes tight parking maneuvers almost relaxing.

Camera Systems for Total Visibility

The available 360° Surround View Camera gives you a bird’s-eye view of the truck on the large touchscreen . Even better, the 360° Trailer Surround View Camera keeps an eye on the area around your trailer, which is invaluable when navigating crowded campgrounds or job sites.

The Digital Rearview Mirror transforms into a live video feed when you flip a switch . If your rear view is blocked by a tall load or a trailer, the mirror shows a clear, wide-angle view from a camera mounted on the back of the truck. Activate the available wired Tow Mode Camera, and you get a view directly behind your trailer, eliminating blind spots.

Trailer Monitoring and Control

Trailer-Tow Pages display comprehensive monitoring information right on the touchscreen . You can check trailer tire pressure for up to four tires, see trailer light status, monitor brake gain, and access auxiliary camera views. The Trailer Light Check feature lets you verify that all your trailer lights are working without needing a second person to stand behind the trailer.

Blind Spot Monitoring with Trailer Tow Detection automatically adjusts its coverage zone based on the length of your trailer . It’s a simple feature that provides immense peace of mind when changing lanes on the highway.

Integrated Towing Hardware

The available Fifth-Wheel/Gooseneck Prep Package comes with a factory-installed rear-axle structural crossmember with integrated mounting hardware . This makes installing a fifth-wheel or gooseneck hitch quick and straightforward, with reinforced mounting points engineered to handle the massive loads the 3500 is capable of pulling.

Smart Exhaust Brake

The Automatic Smart Exhaust Brake is a feature you’ll appreciate on every downhill grade . With the push of a button, it helps control speed on long descents without riding the service brakes. The system works automatically, engaging when needed and backing off when the grade levels out. This saves your brakes from overheating and gives you more control with less effort.

Payload Considerations: It’s Not Just About Towing

Towing capacity gets the headlines, but payload capacity is equally important. Payload includes everything you put in the truck—passengers, cargo in the bed, the weight of the hitch, and the tongue weight of the trailer.

The Ram 2500 with the Cummins diesel offers up to 3,600 pounds of payload . This is substantial and will cover most recreational towing needs. For example, a 15,000-pound fifth-wheel trailer typically has a tongue weight of 3,000-3,750 pounds, which would max out or exceed the 2500’s capacity. Always calculate total payload carefully.

The Ram 3500 with dual rear wheels and the Cummins handles up to 6,050 pounds of payload . This massive capacity means you can load the bed with heavy materials, carry a slide-in camper, or handle the heavy tongue weights of large fifth-wheel trailers without worry.

The gasoline HEMI V-8 actually offers higher payload ratings than the diesel—3,930 pounds in the 2500 and 7,590 pounds in the 3500 . This is because the diesel engine weighs more, reducing the available capacity for cargo. If maximum payload is your priority and you don’t need diesel towing, the HEMI is worth considering.

Real-World Towing Scenarios

Let’s look at what these numbers mean in practical terms.

Scenario 1: Large Travel Trailer

A typical large travel trailer weighs 8,000-12,000 pounds with a tongue weight of 800-1,200 pounds. Both the Ram 2500 and 3500 handle this easily. The 2500’s smoother ride makes it the better choice if you’re not regularly towing heavier loads.

Scenario 2: Fifth-Wheel RV

A mid-size fifth-wheel weighs 12,000-16,000 pounds with a pin weight of 2,400-3,200 pounds. The Ram 2500 can handle this if you stay at the lower end of the range and keep other payload light. For heavier fifth-wheels, the Ram 3500 is the better choice, providing more margin and stability.

Scenario 3: Heavy Equipment Trailer

If you’re hauling construction equipment or farm machinery weighing 18,000-25,000 pounds, the Ram 3500 with dual rear wheels is the only choice. The 2500’s 20,000-pound limit would be exceeded, and you need the 3500’s higher GVWR and payload capacity to handle the tongue weight.

Scenario 4: Commercial Grain or Livestock Hauling

At the extreme end, with trailers approaching 35,000 pounds, the Ram 3500 DRW with the High-Output Cummins is purpose-built for this work. The combination of massive power, heavy-duty chassis, and integrated towing hardware makes these demanding jobs manageable.

Warranty and Ownership

Ram backs these heavy-duty trucks with substantial warranty coverage:

Basic Warranty: 3 years or 36,000 miles (60,000 km in Canada)
Cummins Diesel Engine Warranty: 5 years or 100,000 miles (160,000 km in Canada)
Powertrain Warranty (Canada): 10 years or 160,000 km on select models

The diesel engine warranty specifically covers repair or replacement of factory-installed parts for the engine, reflecting confidence in the Cummins durability .

Frequently Asked Questions About the 6.7L Cummins High-Output Diesel

What is the horsepower and torque of the 2026 6.7L Cummins High-Output?

The engine produces 430 horsepower at 2,800 rpm and 1,075 lb-ft of torque at 1,800 rpm .

How much can a Ram 2500 with the 6.7L Cummins High-Output tow?

The Ram 2500 can tow up to 20,000 pounds when properly equipped with the High-Output Cummins diesel .

What is the maximum towing capacity of the Ram 3500 with the 6.7L Cummins?

The Ram 3500 with dual rear wheels and the High-Output Cummins can tow up to 36,610 pounds with a fifth-wheel or gooseneck hitch .

What transmission pairs with the 2026 Cummins High-Output?

The engine mates to a new TorqueFlite HD eight-speed automatic transmission from ZF, replacing the previous six-speed .

What is the payload capacity of trucks with this engine?

The Ram 2500 diesel offers up to 3,600 pounds of payload, while the Ram 3500 diesel handles up to 6,050 pounds .

What fuel tank capacity is available?

Crew Cab models with the 8-foot bed offer a largest-in-class 50-gallon fuel tank .

What towing technology does the 2026 Ram offer?

Key technologies include Trailer Reverse Steering Control, 360° Surround View Camera with trailer coverage, Digital Rearview Mirror with tow mode, Trailer-Tow Pages with tire pressure monitoring, and Blind Spot Monitoring with trailer coverage .

Is the 6.7L Cummins High-Output available in both the Ram 2500 and 3500?

Yes, the High-Output 6.7L Cummins is available in both the 2026 Ram 2500 and Ram 3500 models .

References

What are you planning to tow with your Ram? Share your setup and experiences in the comments below.

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