2020 GMC Sierra 2500HD Road Test - Consumer Reports
The redesigned, next-generation Sierra HD's exterior is more visually distinguished from the Sierra 1500. Aside from its roof, which is shared with the light-duty Sierra, all other visible elements are unique to the work-focused HD truck. The standard engine is a 401-hp, 6.6-liter V8 with a six-speed transmission. A 445-hp, 6.6-liter turbodiesel V8 engine with a 10-speed transmission is also available.
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GMC Sierra 2500HD Road Test
First Drive

Big, Burly 2020 GMC Sierra 2500HD and Chevrolet Silverado 2500HD

These redesigned work trucks have more power, towing capability, and interior room


General Motors has redesigned its large 2500HD truck line for 2020. (The 2500 references a three-quarter ton payload capacity. This is a historic reference; modern trucks in this class can haul much more than that. The HD is shorthand for heavy-duty.) In any parlance, we can tell you that these GMC and Chevrolet behemoths are bigger and tougher than ever.

GM has supersized these trucks in just about every way, marking the first time the GM HD trucks are truly bigger than their light-duty counterparts.

These new trucks are 10.4 inches longer, ride on a wheelbase that's 5.2 inches longer, stretch 1.4 inches wider, and stand 1.6 inches taller. And there's an extra 3 inches of legroom for second-row passengers in crew-cab models. Leave no doubt: These are substantial trucks.

The standard engine is a 401-hp, 6.6-liter V8 with a six-speed transmission. The other choice—and what we drove—is a 445-hp, 6.6-liter turbodiesel V8 engine mated to an Allison 10-speed transmission. This tow-ready engine produces a prodigious 910 lb.-ft. of torque.

When properly equipped, GM claims that the new HDs can tow up to 35,500 pounds.

We rented two of GM’s new crew-cab trucks: a Chevrolet Silverado 2500HD 4WD LTZ and GMC Sierra 2500HD 4WD AT4. Here’s what we’ve learned during our time and miles with these titanic trucks.

Impressions The combination of GM’s V8 turbodiesel engine and the smooth Allison 10-speed transmission is a match made in mechanical heaven. Seemingly endless supplies of power and torque make this powertrain shine, and it pulls and pulls even at low revs.
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