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The 2027 Chevrolet Silverado HD introduces an all-new 8.3L Duramax Turbo-Diesel V8 producing 1,230 lb-ft of torque, best-in-class figures. Both new engines pair with a 10-speed Allison automatic, a significant upgrade over the prior generation’s powertrain lineup. This page covers what each engine delivers, which trims offer them, and how to find your build at Greg Hubler Chevrolet.
The biggest story on the 2027 Silverado HD is what sits under the hood. Chevrolet redesigned both engine options from the ground up, and the numbers reflect that ambition.
The all-new Duramax 8.3L Turbo-Diesel V8 is the headline powertrain. It produces 555 horsepower and 1,230 lb-ft of torque, which Chevrolet claims as best-in-class on both counts. Chevrolet 2027 Silverado HD official specs For buyers who tow heavy fifth-wheel trailers, horse trailers, or commercial equipment on a regular basis, those numbers translate directly into real pulling capacity. Max available towing with the diesel reaches 38,000 lbs, also a best-in-class figure.
The enhanced 6.6L gas V8 is the standard powertrain. It produces 412 horsepower and 472 lb-ft of torque, with max available towing of 19,000 lbs and max available payload of 6,990 lbs. The gas engine is built in Tonawanda, NY, and the Duramax diesel is built in Brookville, OH.
Both engines are paired exclusively with a 10-speed Allison automatic transmission, which is the same unit used across the HD lineup.
The 8.3L Duramax is a turbocharged, eight-cylinder diesel engine displacing 8.3 liters. Diesel combustion generates torque at lower RPM than gasoline, which is precisely why diesel HD trucks have traditionally dominated towing applications. The 1,230 lb-ft torque figure means the engine can sustain massive pulling loads without straining, particularly on grades where torque demand is highest.
The 10-speed Allison transmission works directly with the diesel’s power band to hold gears intelligently under load. Diesel exhaust braking, available with this transmission, uses engine compression and exhaust restriction to slow the truck on downhill grades, reducing heat stress on the brake system when descending with a heavy trailer. The 2027 Silverado HD’s eBoost electronic braking system, featuring 14.6-inch front rotors and four-piston calipers, works alongside exhaust braking to provide layered stopping control.
The 6.6L gas V8 has been enhanced for 2027, delivering more horsepower and torque than its predecessor. At 412 hp and 472 lb-ft of torque, it handles demanding towing and payload work without requiring diesel fuel infrastructure. The gas engine also now includes a Driver Information Center readout as standard equipment, adding visibility into vehicle performance data. Its 6,990 lb payload rating is the highest in the lineup across both engine options.
Both powertrains use Tow/Haul Mode, which increases steering damping for better trailer stability, and both benefit from the first-in-class electric power steering system that reduces kickback and improves maneuverability on switchbacks or tight jobsite turns.
The 2027 Silverado HD is offered in six trims: WT, Custom, LT, LTZ, ZR2, and High Country. The enhanced 6.6L gas V8 is standard across the lineup. The all-new Duramax 8.3L Turbo-Diesel V8 is available as an upgrade on trims where the option is offered.
The entry trim focuses on work capability. The gas V8 is standard, with the Duramax available for buyers who need maximum diesel towing capacity.
Adds value-focused features over the WT. Trail Boss configuration is now available on Custom for the first time, extending off-road capability to this trim level. Engine choice follows the same gas-standard, diesel-available structure.
The LT broadens the appeal with versatility features. Both engine options are available.
The LTZ packages premium features with serious capability. The Duramax diesel option here suits buyers who want both luxury and maximum towing performance.
The ZR2 is the HD’s off-road performance trim, adding Multimatic DSSV dampers, a rear e-locker, 35-inch MT tires, aluminum skid plates, and a 1.5-inch factory lift. It is also the first HD trim to offer Terrain Mode, made possible by the new electric power steering system. Both engine options are available.
The pinnacle trim of the lineup pairs luxury appointments with the full range of powertrain capability. Buyers who want the 8.3L Duramax with premium interior features choose the High Country.
The diesel powertrain also carries a longer powertrain warranty: 5 years and 100,000 miles versus 5 years and 60,000 miles for the gas engine.
For a buyer in Camby hauling a loaded gooseneck trailer to a jobsite before sunrise, the 1,230 lb-ft of diesel torque means the truck pulls confidently from a stop without laboring, holds highway speeds on grades, and slows predictably on the descent using exhaust braking instead of wearing down the brakes. The 38,000 lb max towing figure is not just a headline number. It is the difference between needing one trip and needing two.
For a buyer who fuels up at a standard pump and needs strong payload performance, the 6.6L gas V8’s 6,990 lb payload rating covers most commercial and farm use cases without the added complexity of diesel exhaust fluid management. The Allison 10-speed keeps the gas engine in its torque curve under load, so the driving experience under tow feels controlled rather than strained.
The eBoost braking system, with its 14.6-inch front rotors and four-piston calipers, benefits both powertrains. Brake response is faster and more consistent, which matters most during repeated stops at a construction site or when managing speed while towing on a mountain pass.
OnStar Basics is included for 8 years on every Silverado HD, adding automatic crash response and remote commands across all trim and engine combinations.
Chevrolet’s decision to increase diesel displacement to 8.3 liters is a direct response to the competitive HD truck segment. The 1,230 lb-ft torque output and 38,000 lb tow rating are positioned as best-in-class. Rival HD trucks from Ford and Ram have established strong diesel reputations, but the 2027 Silverado HD’s torque and towing figures, as stated by Chevrolet, exceed current competitive benchmarks. HD truck segment towing comparison
The first-in-class electric power steering system is a differentiator that no other HD truck currently offers. It contributes to the ZR2’s new Terrain Mode and provides a steering feel that is notably different from the hydraulic systems used across the competition. Combined with eBoost braking, the 2027 Silverado HD represents a significant engineering shift in how an HD pickup manages power delivery and vehicle control.
The 10-speed Allison automatic is widely regarded as one of the best heavy-duty transmissions available. Its integration with diesel exhaust braking on the Duramax engine gives the 2027 Silverado HD a braking system that stands apart from rivals who rely on fewer transmission speeds or less sophisticated grade-braking strategies.
Greg Hubler Chevrolet serves Camby and the surrounding Indiana communities. The 2027 Silverado HD is expected to be available for ordering later in 2026, and Greg Hubler Chevrolet is the place to get in line, compare engine options, and configure the right trim for your work needs.
The 2027 Silverado HD’s available Duramax 8.3L Turbo-Diesel V8 produces 1,230 lb-ft of torque, a best-in-class figure. The gas V8 produces 472 lb-ft of torque.
Max available towing with the Duramax 8.3L diesel is 38,000 lbs. With the enhanced 6.6L gas V8, max available towing is 19,000 lbs.
Both the diesel and gas engines pair with a 10-speed Allison automatic transmission across the entire Silverado HD lineup.
The Duramax 8.3L Turbo-Diesel V8 is available, not standard, and can be selected across the Silverado HD trim range including WT, Custom, LT, LTZ, ZR2, and High Country. The 6.6L gas V8 is the standard engine on all trims.
Max available payload with the gas V8 configuration is 6,990 lbs. With the diesel configuration, max available payload is 6,170 lbs.
Diesel exhaust braking uses the Allison 10-speed transmission and engine compression to restrict exhaust flow, which slows the truck on downhill grades. This reduces heat stress on the brake system when towing a heavy load downhill and works alongside the eBoost electronic braking system.
The gas V8 carries a 5-year / 60,000-mile powertrain warranty. The Duramax diesel carries a longer 5-year / 100,000-mile powertrain warranty. Both share a 3-year / 36,000-mile basic warranty.
The 2027 Silverado HD is expected to be available for ordering later in 2026. Contact Greg Hubler Chevrolet in Camby, IN to get on the notification list.
