The most revealing detail about the diesel Ram Power Wagon is not its torque figure. It is the equipment choice that accompanies it: Ram now offers Cummins power in its dedicated heavy-duty off-roader, while reserving the factory WARN winch option for gasoline versions. The 2027 equipment announcement makes that distinction important. This is not simply the familiar trail truck with a stronger engine dropped into an otherwise unchanged specification.
The appeal is nevertheless substantial: combine the Power Wagon’s traction hardware with a powertrain suited to heavy towing. Ram announced that combination on January 1, 2026, for the 2027 model year—not for 2025. Its original diesel announcement turns an old enthusiast wish into a production proposition. Understanding what changes, and what does not, is more useful than declaring it America’s most capable pickup.
First, Separate the Model Years
The 2025 Power Wagon was a gasoline truck. Ram’s 2025 capability chart places it under the 6.4-liter HEMI V8, rated at 405 horsepower and 429 lb-ft, with an eight-speed automatic. MotorTrend’s contemporary Ram HD first drive likewise explicitly identifies the Power Wagon as gas-only. Diesel specifications elsewhere in the HD range cannot be transferred to that trim.
For 2027, the available 6.7-liter Cummins high-output inline-six supplies 430 horsepower and 1,075 lb-ft through a TorqueFlite HD eight-speed automatic, according to Ram’s powertrain specifications. The distinction matters when shopping used trucks or comparing reviews: a 2025 Power Wagon and a 2027 diesel Power Wagon represent different capability packages, not merely different registration dates.
By October 27, 2026, the diesel is no longer an unannounced possibility. Ram’s 2027 retail model page lists it as an available Power Wagon engine. That establishes the offering, not the stock status of any particular dealership.
Traction Hardware Does a Different Job Than Torque
The diesel retains front and rear electronic-locking differentials and a disconnecting front stabilizer bar, alongside Bilstein shocks and underbody protection, according to Ram’s technical description. Those components explain why this is more than an appearance package. They address the uneven wheel loading that makes rocky terrain difficult even for powerful four-wheel-drive trucks.
A locked differential mechanically couples the axle shafts so that the wheels turn at the same speed. As Ram’s earlier Power Wagon owner’s manual explains, that function is intended for difficult, low-speed off-road situations, including conditions where a wheel may lose ground contact. Engine torque and differential locking therefore answer different questions: how much twisting force is available, and whether unequal traction can prevent useful progress.
The disconnecting sway bar addresses suspension movement rather than engine output. Ram’s 2025 owner’s manual describes greater front suspension travel when disconnected and warns against using locked axles for normal road driving. These are specialized tools, not settings that make every surface easier. Their value lies in applying the appropriate function to the obstacle, rather than treating every illuminated off-road switch as an improvement.
The Winch Is a Real Choice, Not a Footnote
A description combining Cummins power, both lockers, the disconnecting sway bar and a factory WARN winch rolls separate configurations into one imaginary equipment list. For 2027, Ram lists the winch as a standalone option on HEMI-powered Power Wagon and Rebel models. It should not be presented as part of the diesel Power Wagon package.
Nor should buyers assume every earlier gasoline example has identical equipment. Ram’s 2026 Lunar Edition announcement identifies a 12,000-pound WARN Zeon-12 winch within the Power Wagon Level 2 Equipment Group. Factory availability and standard fitment are different things.
That distinction changes the buying discussion. Someone prioritizing integrated recovery equipment has a different checklist from someone prioritizing a heavily loaded trailer. Neither preference is inherently more serious; they simply ask the truck to solve different problems.
Measure Work Capability at the Truck, Not the Badge
Ram announced nearly 20,000 pounds of towing capacity and almost 3,000 pounds of payload for the diesel Power Wagon, plus available fifth-wheel/gooseneck preparation. Those are manufacturer figures, not results from an independent towing test. They describe a meaningful expansion of the Power Wagon’s working brief.
For context, Ram advertised the gasoline 2026 Power Wagon at up to 10,590 pounds towing and 1,570 pounds payload in its model description. That comparison is more informative than borrowing the highest capacity advertised anywhere in the 2500 range. A shared badge does not make every configuration interchangeable.
The practical implication is to begin with the intended load, then investigate the specific truck. A camping build, equipment trailer and passenger-heavy family trip are different assignments. The diesel’s broader ratings make it a candidate for more of them, but selecting the engine is only the beginning of matching the vehicle to the job.
A Broader Power Wagon, Not an Unqualified Champion
Ram calls the Power Wagon its most off-road-capable production full-size pickup in the 2027 lineup announcement. That is a manufacturer’s positioning claim, not a universal comparison result. Likewise, an equipment list cannot establish long-term durability or justify describing a truck as unstoppable.
The stronger conclusion is narrower and more useful. The diesel option expands what a Power Wagon buyer can reasonably consider without abandoning the model’s defining traction equipment. The gasoline version retains a distinct attraction through its factory winch option. Choosing between them means deciding which capability matters on the trips actually planned—not collecting the largest numbers from two different trucks and pretending they belong to one.
Cover: Ram 2500 Power Wagon Diesel Crew Cab 4×4 at the 2026 New York International Auto Show, photographed April 10, 2026. The diesel variant was introduced for model year 2027; the source title uses 2026. Photo: Charles (usf1fan2), via Wikimedia Commons. Photographer: https://www.flickr.com/people/charles79/ — CC0 1.0: https://creativecommons.org/publicdomain/zero/1.0/ · Photo source · CC0 1.0 Universal Public Domain Dedication. Original photograph; WordPress may create display-size derivatives.
Sources
- What's New for 2027: Ram Heavy Duty
- You Asked, Ram Delivered: Ram Power Wagon With 6.7-Liter Cummins HO Turbo Diesel
- 2025 Ram Heavy Duty Payload and Towing Weight Capacities
- 2025 Ram 2500/3500 Heavy Duty First Drive Review: Domesticated Freight Train
- 2027 Ram 2500
- 2016 Ram 1500/2500/3500 Owner's Manual
- 2025 Ram 2500/3500 Owner's Manual
- Ram Lunar Special Edition Trucks Return
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