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The 2027 Chevrolet Silverado HD delivers 1,230 lb-ft of torque and a 38,000-lb tow rating from its all-new Duramax 8.3L V8. The Sierra HD matches those peak diesel numbers but trails on standard tech content and trim-level off-road access. This page breaks down every key difference so you can find the right truck at Greg Hubler Chevrolet.
For buyers who need the most capable off-road HD truck available today, the Silverado HD ZR2 gives you Terrain Mode, Multimatic DSSV dampers, a rear e-locker, and 35-inch MT tires in one purpose-built package at a lower trim entry point than the Sierra HD AT4X. If your priority is a luxury-first cabin with the diesel engine standard, the Sierra HD Denali Ultimate packages the 8.3L diesel as standard equipment. For pure workhorse value and broader safety content right out of the box, the Silverado HD is the stronger choice.
| Spec | 2027 Silverado HD | 2027 Sierra HD |
|---|---|---|
| Gas Engine | 6.6L V8, 412 hp / 472 lb-ft | 6.6L V8, 412 hp / 472 lb-ft |
| Diesel Engine | 8.3L Duramax V8, 555 hp / 1,230 lb-ft | 8.3L Duramax V8, 555 hp / 1,230 lb-ft |
| Transmission | Allison 10-speed automatic | Allison 10-speed automatic |
| Max Towing (diesel) | 38,000 lbs | 38,000 lbs |
| Max Towing (gas) | Chevrolet has not yet released a confirmed figure | 19,000 lbs |
| Max Payload (gas) | 6,990 lbs | GMC has not yet released a confirmed figure |
| Front Rotors | 14.6-inch (eBoost) | 14.6-inch (eBoost) |
| Standard Safety Suite | AEB, Lane Keep, Adaptive Cruise, Forward Collision Alert, Pedestrian Braking | Adaptive Cruise with trailering, Trailer Brake Controller |
| Infotainment Screen | 13.4-inch (standard) | 13.4-inch (available) |
| Driver Info Center | 12.3-inch | 12.3-inch (available) |
| Head-Up Display | Chevrolet has not yet released a confirmed figure | 15-inch multicolor (available) |
| Seating | 6 | GMC has not yet released a confirmed figure |
| Trims | WT, Custom, LT, LTZ, ZR2, High Country | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate |
| Powertrain Warranty (diesel) | 5 yr / 100,000 mi | 5 yr / 100,000 mi |
Both trucks share the same two engine options. The standard 6.6L gas V8 produces 412 hp and 472 lb-ft in both the Silverado HD and the Sierra HD. The available Duramax 8.3L Turbo-Diesel V8 produces 555 hp and 1,230 lb-ft in both trucks, paired in each case with the Allison 10-speed automatic.
On towing, both trucks reach 38,000 lbs when equipped with the diesel engine and proper configuration. The Sierra HD gas engine is rated at 19,000 lbs of towing capacity. Chevrolet has not yet released a confirmed gas-engine towing figure for the 2027 Silverado HD. Both trucks use diesel exhaust braking combined with the Allison transmission to manage brake stress on long downhill grades.
The eBoost electronic braking system with 14.6-inch front rotors and four-piston calipers appears on both trucks as a segment-first feature. Electric power steering is also segment-first on both platforms, reducing hydraulic noise and steering kickback on rough terrain.
The Silverado HD seats six passengers. GMC has not yet released a confirmed seating-capacity figure for the 2027 Sierra HD. Both trucks step up cabin quality as you climb the trim ladder. The Silverado HD High Country targets the same buyer as the Sierra HD Denali, with premium leather appointments and a refined interior environment. The Silverado HD’s 13.4-inch touchscreen is standard equipment, meaning every buyer in the lineup gets that screen regardless of trim. The Sierra HD’s 13.4-inch infotainment system is listed as available rather than standard, which means base Pro trim buyers may not receive it.
The Sierra HD Denali Ultimate offers an exclusive Alpine Umber interior with full-grain leather seating and 16-way power front seats with a massage feature. The Silverado HD’s cabin options at High Country are strong, but Chevrolet has not yet published a confirmed equivalent seat configuration for the 2027 Silverado HD. Both trucks carry the Multi-Flex tailgate and a durable bed floor.
The Silverado HD’s standard safety content is broader than what GMC confirms at base trim. Every Silverado HD comes with:
The Sierra HD confirms Adaptive Cruise Control with trailering capability and a Trailer Brake Controller as standard on the Pro trim, but GMC has not yet published confirmation that AEB, Lane Keep Assist, and Pedestrian Braking are standard across the 2027 Sierra HD lineup.
On the tech side, the Silverado HD brings Google Gemini AI and available Google Built-In to the cabin. The Sierra HD does not list those features in its confirmed specs. Both trucks offer up to 14 available camera views for hitching, reversing, and trailer monitoring. The Sierra HD adds an available 15-inch multicolor Head-Up Display. Chevrolet has not yet published a confirmed Head-Up Display specification for the 2027 Silverado HD.
OnStar Basics is standard on the Silverado HD for 8 years, covering remote commands, Automatic Crash Response, built-in voice assistance, real-time navigation, and access to audio streaming apps.
Silverado HD technology features
The Sierra HD AT4X debuts Terrain Mode on that platform. The Silverado HD ZR2 also carries Terrain Mode, marking the HD-first appearance of that feature on the Chevrolet side.
The Silverado HD powertrain warranty on the diesel engine extends to 5 years or 100,000 miles. The Sierra HD diesel powertrain warranty covers the same 5 years or 100,000 miles. The gas engine powertrain warranty on the Silverado HD covers 5 years or 60,000 miles. The basic bumper-to-bumper warranty is 3 years or 36,000 miles.
OnStar Basics runs standard for 8 years on the Silverado HD, which adds long-term connectivity value without an additional subscription requirement in those initial years.
The Silverado HD ZR2 packages off-road hardware that the Sierra HD spreads across the AT4 and AT4X trims. Buyers who want 35-inch MT tires, Multimatic DSSV dampers, a rear e-locker, and a factory lift can find all of that in a single Silverado HD ZR2 configuration. On the Sierra HD side, the AT4X is required to access that full off-road package, and 35-inch Goodyear MT tires appear at that trim.
For work-oriented buyers who want the full safety suite and confirmed powertrain output numbers from the base trim up, the Silverado HD delivers more confirmed standard content.
The 2027 Silverado HD brings more confirmed standard safety content, a longer diesel powertrain warranty, and the ZR2’s complete off-road package to buyers across the Camby area. Greg Hubler Chevrolet carries Silverado HD inventory across the lineup. Browse current stock, get a trade valuation, or book a test drive today.
Both trucks share a maximum diesel tow rating of 38,000 lbs when properly configured with the Duramax 8.3L Turbo-Diesel V8. The Sierra HD gas engine is rated at 19,000 lbs of towing capacity. Chevrolet has not yet released a confirmed gas-engine towing figure for the 2027 Silverado HD.
Yes. Both feature a 1.5-inch factory lift, Multimatic DSSV dampers, a rear electronic locking differential, 35-inch MT tires, and skid plate protection. Terrain Mode appears on both as well.
Yes. Adaptive Cruise Control is standard on the 2027 Silverado HD across the lineup.
The Silverado HD diesel powertrain warranty covers 5 years or 100,000 miles. The gas engine powertrain warranty covers 5 years or 60,000 miles.
Yes. The Silverado HD offers Google Gemini AI and available Google Built-In connectivity. GMC has not yet published confirmation of those same features for the 2027 Sierra HD.
Yes. The 13.4-inch touchscreen is standard equipment on the 2027 Silverado HD. On the Sierra HD, it is listed as available rather than standard.
Yes. Greg Hubler Chevrolet serves the Camby area with Silverado HD inventory. Browse inventory online to check current stock.
The eBoost system uses 14.6-inch front rotors and four-piston calipers to deliver consistent stopping power, with smoother response under load and improved performance on long downhill grades.
