General Motors Will Update 2027 Silverado and Sierra HD
The 2027 heavy-duty truck models will feature new electronic braking and an 8.3L Duramax diesel engine.
Updated on Sept. 28, 2026 in Trucks
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General Motors is updating its 2027 Chevrolet Silverado HD and GMC Sierra HD trucks with a sophisticated electronic brake-boost system and a new 8.3L Duramax Turbo-Diesel V8 engine. These heavy-duty models are slated to begin arriving at dealerships across the United States in late 2026.
Why it matters
By transitioning to electronic brake-boost and electric power steering, GM aims to reduce component complexity and weight while improving braking consistency. This mechanical overhaul allows for independent calibration, enhancing control both on the road and during off-road maneuvers.
The 2027 heavy-duty trucks feature 14.6-inch front rotors with four-piston fixed calipers and an Allison 10-speed transmission. The new engine produces 555 hp and 1,230 lb-ft of torque, enabling a maximum trailering capacity of 38,000 pounds.
The players
General Motors
General Motors is a multinational automotive manufacturer that designs, produces, and distributes a wide range of trucks, SUVs, and passenger vehicles globally.
Chevrolet
Chevrolet is a prominent American automobile division of General Motors known for its extensive lineup of consumer and commercial trucks.
GMC
GMC is a division of General Motors that specializes in trucks, SUVs, and vans with a focus on professional-grade engineering and premium features.
The details
Engineers decoupled the braking and steering systems by replacing hydraulic-assisted components with rack-and-pinion electric steering and electronic brake-boost technology. Additionally, the new Terrain Mode on ZR2 and AT4X models provides one-pedal driving functionality by automatically applying brakes when the driver lifts off the accelerator.
Timeline
The updated heavy-duty truck models will debut for the 2027 model year.
Dealership arrivals are expected to commence in late 2026.
Roadmap
This move reflects a broader industry shift toward electrifying chassis systems to optimize vehicle weight and component integration. By removing shared hydraulic sources, GM positions its heavy-duty lineup to better manage the growing demands of high-torque diesel towing and modern driver-assist features.
Buyers can expect increased towing confidence and better handling control due to the new electronic braking and steering systems. Shoppers should look for future announcements regarding specific trim pricing and package availability as the late 2026 launch date approaches.
The takeaway
The move to electronic braking represents a significant step toward simplifying heavy-duty mechanical systems while increasing precision. Owners planning to utilize these trucks for heavy towing should note the performance improvements provided by the 8.3L Duramax powertrain and the new one-pedal off-road capabilities.
Further reading
For more information on current and upcoming vehicle releases, visit the Trucks section.
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