Chevy Duramax® 6.6L Diesel vs. Ram Cummins 6.7L Diesel │Libertyville Chevrolet

What are the differences and similarities between the Chevy Duramax® and Ram Cummins turbo diesel engines? This Chevy Duramax® vs. Ram Cummins breakdown seeks to answer your most pressing queries about these two diesel engine options.

After you’ve finished reading this Duramax® vs. Cummins engine guide, browse Libertyville Chevrolet’s new inventory, then schedule a test drive in Libertyville, IL, with your favorite Chevy truck. Have further questions about Chevy diesel engines or Chevy in general? Our product specialists are always happy to help via phone at (847) 892-1530 or through our online form.


Engine Specs

Both the Ram 6.7L Cummins and Chevy Duramax® 6.6L turbo diesel engines produce similar performance capabilities built for the heavy loads that jobsites require. The following engine comparison table shows that Chevy’s diesel engine pumps out more horsepower of the two options, making this turbo diesel a true workhorse.

Chevy Pickup Truck Brand Ram
Duramax® 6.6L turbo diesel V8 Engine 6.7L Cummins turbo diesel
445 HP Horsepower 400 HP
910 lb.-ft. Torque 1,000 lb.-ft.

Engine Features

Silverado Duramax® engine

Both the Ram and Chevy diesel engines provide a number of smaller parts to create heavy-duty performers. The Chevy Duramax® and Ram Cummins are equipped with exhaust brakes and engine heaters, features that are important for reliable engine execution. However, the Chevy Duramax® engine is paired with several features not found on the Ram Cummins, such as:

  • Allison® transmission
  • B20-Diesel compatible
  • 3.73 gear ratio
  • Capped fuel fill
  • Tow/Haul mode
  • Auto Grade Braking

Models Available with Diesel Engines

The Chevy Duramax® 6.6L turbo diesel is available with the 2019 and 2020 Silverado 2500HD and 3500HD trucks.

2019 Silverado 2500 HD

2019 red Chevrolet Silverado 2500 HD LTZ

2019 Silverado 3500 HD

2019 black Chevrolet Silverado 3500 HD High Country


Why Choose Chevy Duramax®?

Chevy Duramax® creates dynamic energy that you can feel in your bones every time you rev your engine or hitch a trailer to your truck. Beyond that, the Allison® transmission was made by military tank transmission creators. This transmission is electronically controlled with overdrive to achieve effortless execution, leading to excellent capabilities on a typical haul day.