The 2027 Chevrolet Silverado HD and GMC Sierra HD gain a new diesel V8, greater towing capability and Canadian-developed technology.
- The 2027 Chevrolet Silverado HD and GMC Sierra HD offer an available 8.3-litre Duramax with 555 horsepower and 1,230 lb-ft of torque.
- Maximum gooseneck towing reaches 38,000 pounds on properly equipped models.
- Oshawa is confirmed to build both next-generation HD trucks, although timing has not been specified.
2027 Silverado HD | Photo: GMCNearly 65% of Canadian heavy-duty pickup buyers choose diesel, according to General Motors. That helps explain why the company is investing in an all-new 8.3-litre Duramax turbo-diesel V8 for the 2027 Chevrolet Silverado HD and GMC Sierra HD.
Customers towing equipment or large recreational trailers remain a substantial audience for diesel power. GM’s latest updates address that demand with a new engine, revised steering and braking systems, and technology developed with help from its Canadian Technical Centre.
2027 GMC Sierra HD | Photo: GMCA New Duramax Designed In-House
The optional 8.3-litre V8 produces 555 horsepower and 1,230 lb-ft of torque. GM says those figures lead the heavy-duty diesel pickup segment based on available competitive information.
The company describes this as its first clean-sheet heavy-duty pickup diesel V8 designed, developed and manufactured entirely in-house. It features a compacted graphite iron block, forged internal components and a variable-geometry turbocharger, with cooling upgrades intended to support sustained towing.
The engine will be built at GM’s expanded DMAX facility in Brookville, Ohio.
Buyers can also choose an updated 6.6-litre gasoline V8 producing 412 horsepower and 472 lb-ft of torque. Both engines use an Allison 10-speed automatic transmission.
Steering and Braking Catch Up With the Muscle
Maximum towing reaches 20,000 pounds (9,072 kg) with a conventional trailer and 38,000 pounds (17,237 kg) with a gooseneck setup, depending on equipment and configuration.
GM says it developed the powertrain, steering, braking and trailering systems together. New rack-and-pinion electric power steering is intended to reduce kickback and improve low-speed manoeuvring, while electronic brake assistance works with larger front rotors and four-piston fixed calipers. GM describes both assistance systems as segment firsts.
The company also claims its new eBoost braking system can shorten stopping distances by up to 20% when towing. The supplied information does not specify the comparison vehicle or test conditions.
2027 GMC Sierra HD | Photo: GMCCanada’s Role Extends Beyond Assembly
GM’s Canadian Technical Centre contributed to trailering systems and integrated controls for the HD trucks.
Silverado HD production continues in Oshawa and Flint, Michigan, while Sierra HD production continues in Flint. GM also confirms that Oshawa will build both next-generation Silverado HD and Sierra HD trucks. It has not specified when that future production will begin, so this should not be interpreted as confirmation of Oshawa-built 2027 Sierra HD models.
The updated 2027 trucks are expected at Canadian dealerships beginning in late 2026. Pricing and additional details will follow.
