“The 2019 Ram Heavy Duty (2500 and 3500) is officially the first heavy-duty truck from the US' Big Three to reach 1,000 pound-feet of torque. That monster output comes as part of an optional 6.7-liter Cummins diesel I6, which also makes 400 horsepower. Yet, the engine weighs some 60 pounds less than its previous iteration, thanks to a new cast-iron cylinder head, lighter pistons, new connecting rods and bearings, in addition to an all-new exhaust manifold and tweaked variable-geometry turbocharger.
If you're after diesel, but not the full-bore kit, there's another Cummins on offer with 370 hp and 850 lb-ft.
In terms of transmissions, the big-boy Cummins mates to a six-speed Aisin automatic that's built specifically to handle all that torque. The other, less powerful Cummins variant uses a different six-speed automatic, while the gas V8 hooks up to an eight-speed automatic.“