2027 Chevrolet Silverado HD Specifications
The 2027 Chevrolet Silverado HD runs a standard 6.6L gas V8 rated at 412 horsepower and 472 lb-ft, or an available 8.3L Duramax turbo-diesel V8 rated at 555 horsepower and 1,230 lb-ft. Both use an Allison 10-speed automatic. Properly equipped, it tows up to 20,000 pounds conventional and 38,000 pounds with a gooseneck. Below is every spec Chevrolet has published so far, plus a clear list of what's still missing, put together by the team at Knudtsen Chevrolet in Post Falls.
Want prices and trims instead of numbers? Our 2027 Silverado HD trim levels guide covers all six trims, and the 2027 Silverado HD overview explains what changed and why it matters.
Engine Specifications
There are two engines for 2027: the 6.6L gas V8 is standard, and the 8.3L Duramax diesel is a $11,400 option on every 2500 HD trim. The diesel makes 143 more horsepower and 758 more lb-ft than the gas engine.
| Spec | 6.6L gas V8 | 8.3L Duramax turbo-diesel V8 |
|---|---|---|
| Availability | Standard | Available ($11,400 on 2500 HD) |
| Displacement | 6.6 liters | 8.3 liters |
| Horsepower | 412 hp (rpm not yet released) | 555 hp at 2,500 rpm |
| Torque | 472 lb-ft | 1,230 lb-ft |
| Torque peak rpm | Not yet released | Not yet released |
| Block | Not yet released | Compacted graphite iron |
| Rotating assembly | Not yet released | Forged crankshaft and connecting rods, steel pistons |
| Induction | Turbo-Jet intake manifold | Variable-geometry turbocharger, dual-stage air-to-water charge cooling |
| Built in | Tonawanda, New York | Brookville, Ohio (DMAX) |
GM rates the 8.3L as best-in-class diesel horsepower and torque, and the 6.6L as best-in-class standard torque among 2027 HD gas engines. The gas engine also gets an engine-mounted oil cooler, a revised lubrication system and a digital oil-level readout. It isn't the same 6.6L used in the Silverado 1500. Read more in our 8.3L Duramax deep look and our 6.6L gas V8 breakdown.
Transmission
Both engines use one transmission: the Allison 10L1000 10-speed automatic.
| Spec | Detail |
|---|---|
| Transmission | Allison 10L1000 10-speed automatic |
| Engines | 6.6L gas V8 and 8.3L Duramax |
| Shift logic | Advanced shift logic (GM, cited with the 8.3L) |
| Exhaust braking | Upgraded on the 8.3L Duramax |
Towing, Payload and GCWR
The top towing figure is 38,000 pounds with a gooseneck and the 8.3L Duramax, with conventional towing up to 20,000 pounds. Every figure here is a maximum across configurations, not a rating for any one trim.
| Rating | Maximum | Notes |
|---|---|---|
| Conventional towing | 20,000 lbs | Properly equipped, 8.3L Duramax |
| Gooseneck towing | 38,000 lbs | 8.3L Duramax |
| Diesel dual-rear-wheel towing | At least 30,000 lbs | GM: every diesel dually |
| Gas V8 towing | 19,000 lbs | 6.6L gas V8 |
| Payload, gas | 6,990 lbs | 6.6L gas V8 |
| Payload, diesel | 6,170 lbs | 8.3L Duramax |
| GCWR | 46,500 lbs | Select configurations |
Towing and payload by model and configuration (2500 HD vs 3500 HD, single vs dual rear wheel) are not yet released.
Our 2027 Silverado HD towing guide walks through hitch types and what these ratings mean on a real trailer.
2026 vs. 2027 Engine Specs
The diesel gains 85 horsepower and 255 lb-ft over the 2026 6.6L Duramax, and the gas V8 gains 11 horsepower and 8 lb-ft.
| Spec | 2026 | 2027 |
|---|---|---|
| Diesel engine | 6.6L Duramax | 8.3L Duramax |
| Diesel horsepower | 470 hp | 555 hp |
| Diesel torque | 975 lb-ft | 1,230 lb-ft |
| Diesel max towing | 36,000 lbs | 38,000 lbs |
| Gas V8 horsepower | 401 hp | 412 hp |
| Gas V8 torque | 464 lb-ft | 472 lb-ft |
Chassis, Steering and Brakes
The 2027 HD swaps hydraulic steering for an electric rack-and-pinion system and adds eBoost electronic brake boost, and GM calls both segment firsts.
| Component | 2027 Silverado HD |
|---|---|
| Steering | Electric power steering, rack-and-pinion |
| Steering output | About 30% more than the previous hydraulic gear (GM) |
| Brake boost | eBoost electronic brake boost |
| Front rotors | 14.6 inches |
| Front calipers | Four-piston fixed |
| Rear brakes | Upgraded hardware (sizes not yet released) |
| Suspension | Carries over with a retune (Edmunds) |
Steering and brakes no longer share a hydraulic source, so there's no pump, hose or fluid to service on the steering side. Our electric steering and eBoost explainer goes further.
Drive Modes
GM lists four drive modes for 2027, and the newest one, Terrain Mode, is listed for the ZR2.
| Mode | What it does |
|---|---|
| Normal | Everyday driving |
| Tow/Haul | Retunes engine, shifts, exhaust brake, grade braking, steering and brake boost; adds steering damping |
| Off-Road | Allows more wheel slip |
| Terrain Mode (ZR2) | One-pedal driving in 4HI and 4LO; lifting off the accelerator applies the brakes |
ZR2 Off-Road Hardware
The ZR2 sits 2.5 inches higher than a standard HD, per Edmunds: 1.5 inches from the factory lift and about 1 inch from the tires.
| Item | 2027 Silverado HD ZR2 |
|---|---|
| Suspension lift | 1.5 inches (factory) |
| Dampers | Larger Multimatic DSSV |
| Rear differential | Electronic locker |
| Tires | 35-inch mud-terrain |
| Underbody protection | Aluminum skid plates |
| Drive mode | Terrain Mode |
See the 2027 Silverado HD ZR2 page for price and positioning.
Technology and Trailering Specs
Chevrolet lists a 13.4-inch touchscreen and up to 14 camera views for the 2027 HD. These are lineup-wide listings; standard equipment by trim isn't out yet.
| Feature | Status for the 2027 HD lineup |
|---|---|
| Touchscreen | 13.4 inches (standard vs available by trim not released) |
| Driver Information Center | 12.3 inches |
| Google built-in | Available; Chevrolet also lists Google Gemini AI assistant |
| OnStar Basics | Standard for 8 years |
| Camera views | Up to 14, including Transparent Trailer View, Bed View, Surround Vision |
| Trailering app | Available |
| Trailer Side Blind Zone Alert | Available |
| Trailer tire pressure and temperature | Available |
| Oil level sensor | Standard |
Specs Not Yet Released
Chevrolet hasn't published these 2027 Silverado HD specs yet, and we won't guess at them.
| Spec | Status |
|---|---|
| Exterior dimensions | Not yet released |
| Wheelbase | Not yet released |
| Cab configurations | Not yet released |
| Bed lengths | Not yet released |
| GVWR | Not yet released |
| Fuel tank capacity | Not yet released |
| Axle ratios | Not yet released |
| Fuel economy | Not yet released (HD pickups aren't EPA rated) |
| 8.3L bore, stroke and compression ratio | Not yet released |
We'll update this page as Chevrolet releases each figure.
Get the Right Silverado HD Spec at Knudtsen Chevrolet
Tell us what you tow and what goes in the bed, and we'll match you to an engine and configuration. Browse new Silverado HD inventory, or contact our Post Falls sales team. Weighing Ford or Ram? Our Silverado HD vs. Super Duty vs. Ram HD comparison lines up the numbers.
Frequently Asked Questions
What engines are available on the 2027 Silverado HD?
A 6.6L gas V8 with 412 horsepower and 472 lb-ft is standard. An 8.3L Duramax turbo-diesel V8 with 555 horsepower and 1,230 lb-ft is available.
What transmission does the 2027 Silverado HD use?
Both engines use the Allison 10L1000 10-speed automatic.
What is the 2027 Silverado HD's max towing capacity?
Up to 38,000 pounds with a gooseneck and the 8.3L Duramax, and up to 20,000 pounds conventional. The gas V8 tows up to 19,000 pounds.
What size are the 2027 Silverado HD front brakes?
GM lists 14.6-inch front rotors with four-piston fixed front calipers, paired with the new eBoost electronic brake booster.
What is the 2027 Silverado HD's fuel economy?
It hasn't been released. Heavy-duty pickups aren't EPA rated, and GM hasn't published its own figures.