2025 Ram Heavy Duty Debuts New Diesel Engine With 1,075 LB-FT of Torque

• Ram's Heavy Duty pickups get a refresh for 2025.
• Both the 2500 and 3500 are treated to cosmetic, tech and powertrain updates.
• There's a new diesel straight-six engine, plus a carryover V8 option.

A brand-new diesel for 2025

The bigger story is the new 6.7-liter Cummins high-output turbodiesel straight-six engine and its eight-speed automatic transmission. This engine is rated at 430 horsepower and a massive 1,075 lb-ft of torque. A redesigned block and head, heavy-duty pistons, a higher-performance intake manifold, a new turbocharger and a higher-pressure fuel system all work to improve both durability and efficiency, according to Ram. 

Max towing for the Ram 3500 with the diesel is rated at 36,610 pounds when gooseneck trailering and 23,000 pounds with a conventional hitch. For reference, the Ford Super Duty's 6.7-liter Power Stroke diesel V8 makes 1,200 lb-ft of torque and allows a max tow rating of 40,000 pounds — a touch more in both categories than the new Ram with the Cummins engine. 

For the gasoline V8 lovers among you, rest easy. The 6.4-liter Hemi V8 is still here and is rated at 405 hp and 429 lb-ft of torque, and it uses the same new eight-speed gearbox. The transmission has a neat trick (when bolted up to either engine) where it will start in second gear if the truck is unladen, making for a smoother experience when moving off the line. Max towing figures for the gas V8 haven't been released just yet. 

Loads of new tech inside

Part of the Heavy Duty's refresh is a raft of new tech goodies that are, essentially, making their way from the 1500 to the 2500 and 3500. Buyers have the option of either a 12-inch infotainment screen or a new 14.5-inch touchscreen display. The 12-incher has a higher-resolution display than before, while the larger screen can run two major tasks at once, like having both the radio and climate controls on the same screen at the same time. Both systems also feature more memory and a sturdier electrical architecture, which means they're quicker to respond to inputs. 

There is also a 12.3-inch digital gauge cluster that can show nearly 24 different menus. That might seem like overkill, but when you're towing or hauling, engine and oil temperatures might be at the front of your mind, but then you might want to switch to a fuel economy display when you're just driving as usual. The passenger screen that made its debut on the 1500 has been added to the HD models as well, and it can show infotainment information or mirror a phone or tablet via an HDMI connection. 

The 2500 and 3500 also offer a better lane keeping assistance system now, along with dual wireless phone chargers, an optional digital rearview mirror, and an onboard power inverter that can produce up to 2.4 kW of power. The final addition here is a variety of standard and optional safety features. Standard is adaptive cruise control, forward collision warning, and a front/rear parking assist on Big Horn models. Newly optional safety kit includes drowsy driver detection, traffic sign recognition and active lane management. 

The new 2500 starts at $47,560 and the new 3500 is priced from $48,565, including destination, and those prices will rise dramatically as you move up to more luxurious trims. The 2500 and 3500 will be offered in Tradesman, Big Horn, Lone Star, Laramie, Rebel, Power Wagon, Limited Longhorn and Limited variants. Expect to see the new Ram Heavy Duty models on dealer lots in the next few months.