2027 Silverado HD Diesel vs Gas

Knudtsen Chevrolet› Blog› The 2027 Silverado HD 6.6L Gas V8: What's New and Who Should Buy It The 6.6L gas V8 is the standard engine on every 2027 Silverado 2500 HD trim, and it now makes 412 horsepower and 472 lb-ft of torque. It carries the highest maximum payload rating in the lineup, 6,990 pounds, and choosing it keeps $11,400 in your pocket compared with the diesel. For plenty of buyers we talk to at Knudtsen Chevrolet in Post Falls, that's the smarter truck. The 2027 Silverado HD overview covers both engines and the rest of the truck, and the HD trim levels page shows what each of the six trims includes. 412 hp Up from 401 for 2026 472 lb-ft Up from 464 for 2026 6,990 lbs Max payload rating (gas) 19,000 lbs Max towing (gas) New Inventory Pre-owned Inventory New Vehicle Specials Contact Us What changed on the 6.6L gas V8 for 2027? It gained 11 horsepower and 8 lb-ft, and GM reworked the intake, oiling and emissions hardware. GM's stated goal was better pull at low engine speeds, which is where a work truck spends most of its life. New Turbo-Jet intake manifold Revised lubrication system Engine-mounted oil cooler Updated emissions hardware Standard oil level sensor Oil level shown on the driver display GM rates 472 lb-ft as best-in-class standard torque among 2027 heavy-duty gas engines. Of the updates, the digital oil readout is the one owners will notice every week: you can check the level from the driver's seat. Is it the same 6.6L as the Silverado 1500? No. Edmunds reports the HD's 6.6L is a different engine from the 6.6L V8 offered in the light-duty Silverado 1500, even though they share a displacement. The HD gas V8 is assembled in Tonawanda, New York, and it's paired with an Allison 10-speed automatic. If you're cross-shopping and wondering whether a half-ton would do the job, our 2027 Silverado 1500 overview is a good place to compare. Once your trailers or bed loads push past what a 1500 is built for, the HD is where you belong. How does the gas V8 compare with the 8.3L Duramax? The diesel makes more power and tows more; the gas engine carries the higher maximum payload rating and costs $11,400 less. Here are the published numbers: 6.6L gas V8 8.3L Duramax Horsepower 412 555 Torque (lb-ft) 472 1,230 Max towing (lbs) 19,000 20,000 conventional / 38,000 gooseneck Max payload rating (lbs) 6,990 6,170 Added cost (2500 HD) Standard $11,400 Read the payload row carefully. Those are the best ratings Chevrolet lists for each engine across all configurations, not a guarantee that any given gas truck out-carries any given diesel. Look at the 19,000 and 20,000 figures side by side, too: on a bumper-pull trailer the two engines are closer than the headline 38,000 suggests. For the full story on the diesel, see our 8.3L Duramax explainer. How much does a gas 2027 Silverado HD cost? A gas 2500 HD starts at $49,995 for the WT, including the $2,795 destination charge. Every trim comes with the gas V8 standard, so the gap to a diesel is the same $11,400 all the way up. 2500 HD trim 6.6L gas, with destination 8.3L diesel, with destination WT $49,995 $61,395 Custom $53,295 $64,695 LT $56,695 $68,095 LTZ $67,695 $79,095 ZR2 $77,695 $89,095 High Country $78,195 $89,595 One way to look at it: the diesel premium is more than the difference between a WT and an LT. A gas LT, two trims up, still costs less than a diesel WT. Prices are announced 2500 HD figures reported by Autoblog, TFLtruck and CarBuzz. 3500 HD pricing is not yet released, and fuel economy for either engine hasn't been published. Who should buy the gas V8? Buyers whose weight rides in the bed or on a bumper-pull trailer under 19,000 pounds. Here's who we'd steer toward gas. Plow trucks A North Idaho plow truck earns its keep in winter. Put the $11,400 toward the blade and the install, and check the truck's front axle rating with us before you order. Bed-heavy work Contractors hauling tools, materials or a slide-in tank can start from the higher maximum payload rating, then confirm the number on the door label. Weekend towing A boat, a car hauler or a mid-size travel trailer a few times a year doesn't need 1,230 lb-ft. A gas Custom or LT handles it and costs less up front. Budget-first buyers If the payment matters most, gas lets you step up a trim, add the Trail Boss package on the Custom, or simply spend less. If you tow a big fifth-wheel or a gooseneck, that's diesel territory. We'll compare the two engines head to head in an upcoming post. Find a gas 2027 Silverado HD GM expects 2027 Silverado HD trucks at dealers beginning late 2026. Browse new 2027 Silverado 2500 HD trucks at Knudtsen or ask our Post Falls sales team to match a trim and configuration to your payload and trailer. Frequently Asked Questions How much horsepower does the 2027 Silverado HD gas engine have? The 6.6L gas V8 makes 412 horsepower and 472 lb-ft of torque, up from 401 horsepower and 464 lb-ft for 2026. How much can a gas 2027 Silverado HD tow? Chevrolet lists maximum towing of 19,000 pounds with the 6.6L gas V8. Ratings for each configuration have not been released, so check the specific truck. Does the gas Silverado HD have more payload than the diesel? Its maximum payload rating is higher, 6,990 pounds versus 6,170 pounds for the diesel. Those are maximums across configurations, so actual payload depends on the truck you buy. Is the HD 6.6L gas V8 the same engine as in the Silverado 1500? No. Edmunds reports it's a different engine from the light-duty Silverado 1500's 6.6L V8. The HD version is assembled in Tonawanda, New York. What transmission does the gas Silverado HD use? Chevrolet lists an Allison 10-speed automatic with the 6.6L gas V8.

Knudtsen Chevrolet› Blog› The 8.3L Duramax Explained: 555 HP and 1,230 LB-FT The 8.3L Duramax is a brand-new turbo-diesel V8 for the 2027 Silverado HD, and it makes 555 horsepower and 1,230 lb-ft of torque. That's 85 horsepower and 255 lb-ft more than the 6.6L Duramax it replaces, and it lifts maximum gooseneck towing to 38,000 pounds. Below is what's inside it, where it's built, what it costs and what GM hasn't published yet, written for diesel buyers shopping with Knudtsen Chevrolet in Post Falls. If you missed last week's roundup, everything that changed on the 2027 Silverado HD covers the steering, brakes and pricing. The 2027 Silverado HD overview page has the full model picture. 555 hp 8.3L Duramax horsepower 1,230 lb-ft 8.3L Duramax torque 38,000 lbs Max gooseneck towing $11,400 Diesel option on every 2500 HD trim New Inventory Pre-owned Inventory New Vehicle Specials Contact Us How much more power does the 8.3L make than the old 6.6L Duramax? About 18% more horsepower and 26% more torque. GM rates the 8.3L's 555 horsepower and 1,230 lb-ft as best-in-class for a diesel, using SAE testing. 2026 6.6L Duramax 2027 8.3L Duramax Change Horsepower 470 555 +85 Torque (lb-ft) 975 1,230 +255 Max towing (lbs) 36,000 38,000 +2,000 A note on that best-in-class claim: GM's footnote leaves out other GM vehicles. The GMC Sierra HD uses the same 8.3L engine. What's inside the 8.3L Duramax? A compacted graphite iron block, a fully forged crankshaft and connecting rods, and steel pistons. GM describes it as its first clean-sheet heavy-duty V8 designed, developed and manufactured in-house: a new design, not an update of the 6.6L. Bottom end The block is compacted graphite iron. The crankshaft and connecting rods are fully forged, and the pistons are steel. That's a heavy-duty parts list from the ground up, which is what you want in an engine that may spend whole days pulling a trailer. Air and fuel A variable-geometry turbocharger feeds the engine, with dual-stage air-to-water charge cooling and a high-flow fuel injection system. GM also upgraded the engine's cooling system. Noise and vibration GM added isolation hardware at the crankshaft to cut down on noise and vibration in the cab. We'll tell you how it sounds once we've driven one. Exhaust and braking The aftertreatment layout is new, designed to support regeneration during long tows. The exhaust brake is upgraded too, which matters on any long downhill with weight behind you. What transmission comes with the 8.3L? The Allison 10-speed automatic, GM's 10L1000, with what GM calls advanced shift logic. In Tow/Haul mode, GM tunes the engine, shift points, exhaust brake, grade braking, steering and brake boost together for the load. Picture an RV on I-90 heading east over Fourth of July Pass: Tow/Haul handles shifting on the climb, and on the way down the exhaust brake and grade braking take load off the service brakes. Where is the 8.3L Duramax built? At GM's DMAX plant in Brookville, Ohio. GM put $920 million into expanding the plant for this engine, and the facility now covers 1.4 million square feet. Why should a buyer care? An engine designed in-house and built on a line set up for it shows how seriously GM is taking it. GM says more than 60% of its heavy-duty buyers choose diesel. How much can an 8.3L Duramax Silverado HD tow? Up to 38,000 pounds with a gooseneck and up to 20,000 pounds with a conventional hitch, on properly equipped trucks. GM also lists gross combined weight up to 46,500 pounds on select configurations. Every diesel dual-rear-wheel truck is rated for 30,000 pounds or more, according to GM. If you pull a big fifth-wheel camper or a loaded gooseneck horse or equipment trailer around North Idaho, a diesel dually is the place to start, and the label on the specific truck has the final word. Towing and payload ratings for each 2500 HD and 3500 HD configuration are not yet released. Maximum diesel payload is listed at 6,170 pounds; the rating on a given truck depends on cab, bed, drivetrain and equipment. How much does the 8.3L Duramax cost? $11,400 on any 2027 Silverado 2500 HD, per announced pricing. That makes a diesel WT $61,395 and a diesel High Country $89,595, both including the $2,795 destination charge. The option is available on all six 2500 HD trims, from the WT up. To see what the rest of the money buys at each step, check the 2027 Silverado HD trim levels and prices. Not yet released for the 8.3L: fuel economy, the recommended oil specification, warranty terms and 3500 HD pricing. What we do know about upkeep: Chevrolet's covered first maintenance visit within 12 months includes oil and filter, a tire rotation, a multi-point inspection and, on diesels, up to four gallons of DEF. Our Knudtsen service department can book it. Reserve a look at the 8.3L Duramax GM expects the first 2027 Silverado HD trucks at dealers beginning late 2026. Follow our new 2027 Silverado 2500 HD inventory, or tell our Post Falls team the trim and trailer you're planning around and we'll reach out when a matching diesel lands. Frequently Asked Questions Is the 8.3L Duramax a new engine or a bored-out 6.6L? It's new. GM calls it its first clean-sheet heavy-duty V8 designed, developed and manufactured in-house, with its own compacted graphite iron block and forged internals. What transmission does the 8.3L Duramax use? An Allison 10-speed automatic, GM's 10L1000, with what GM calls advanced shift logic. Is the 8.3L Duramax available on the Silverado HD WT? Yes. Announced pricing lists the 8.3L as an $11,400 option on every 2027 Silverado 2500 HD trim, including the WT. What fuel economy does the 8.3L Duramax get? GM hasn't published fuel economy for the 8.3L, and heavy-duty pickups don't carry EPA mileage ratings. Where is the 8.3L Duramax made? GM builds it at its DMAX plant in Brookville, Ohio, which it expanded with a $920 million investment for this engine.

Editor notes (do not publish) URL slug: /blog/2027-silverado-hd-what-changed Publish date: 2026-11-12 (update datePublished in the schema if it goes live on another day) CMS post title (this is the post's H1; the body has no H1 to avoid a double H1): 2027 Silverado HD: Everything That Changed Meta title: 2027 Silverado HD: Everything That Changed Meta description: New 8.3L Duramax, stronger gas V8, electric steering, eBoost brakes and new prices: what changed on the 2027 Silverado HD, from Knudtsen in Post Falls. Last verified: November 3, 2026. Re-check prices on chevrolet.com before publishing. Update when released: Add 3500 HD pricing, per-configuration towing and payload, cab/bed configurations, 8.3L warranty terms, Trail Boss package pricing and LT/LTZ Trail Boss availability, and confirm 2500 HD MSRP once Chevrolet.com posts it. Images to download, rename and upload to /static/dealer-28512/SEO/: /static/dealer-28512/SEO/2027-Chevrolet-Silverado-HD-Hero.png from https://www.chevrolet.com/content/dam/chevrolet/na/us/english/index/trucks/2027-silverado-hd/page-assets/mh/27-silverado-hd-mh-xs-01.png ; /static/dealer-28512/SEO/2027-Chevrolet-Silverado-HD-Capability.png from https://www.chevrolet.com/content/dam/chevrolet/na/us/english/index/trucks/2027-silverado-hd/page-assets/capability/27-silverado-hd-capability-xs-01-v021.png ; Confirm image usage rights. Sources: https://news.gm.com/home.detail.html/Pages/news/us/en/2026/sep/0924-heavy-duty-duramax-83l-turbo-diesel-v8-engine.html ; https://www.chevrolet.com/upcoming-vehicles/2027-silverado-hd ; https://www.chevrolet.com/trucks/silverado/2500hd-3500hd ; https://www.edmunds.com/car-news/2027-chevy-silverado-gmc-sierra-heavy-duty-duramax-diesel.html ; https://www.autoblog.com/news/2027-chevy-silverado-hd-prices-rise-across-the-lineup ; https://tfltruck.com/2026/10/news-2027-chevy-silverado-hd-we-have-official-8-3l-duramax-diesel-pricing-its-better-than-we-thought/ ; https://carbuzz.com/2027-chevrolet-silverado-2500-hd-pricing/ Knudtsen Chevrolet› Blog› 2027 Silverado HD: Everything That Changed The 2027 Silverado HD looks almost the same as the truck it replaces, but the engine choices, the steering and the brakes are all new. There's an 8.3L Duramax diesel, a stronger 6.6L gas V8, electric power steering and an electronic brake booster, and 2500 HD prices went up $1,000 to $1,500 depending on trim. Here's what's different, what isn't, and what Chevrolet still hasn't told us, from the heavy-duty team at Knudtsen Chevrolet in Post Falls. Want the full model rundown first? Our 2027 Chevrolet Silverado HD overview covers the whole lineup, and the Silverado HD trim levels guide lays out all six trims side by side. 555 hp New 8.3L Duramax diesel 412 hp Updated 6.6L gas V8 38,000 lbs Max towing (gooseneck, diesel) $1,000 to $1,500 2500 HD price increase by trim New Inventory Pre-owned Inventory New Vehicle Specials Contact Us Does the 2027 Silverado HD look different? Not much. Chevrolet itself says the outside may look familiar, and Edmunds reports the sheetmetal and the interior both carry over from the current truck. That's a deliberate choice. GM spent its money on the hardware that pulls, steers and stops, which is where an HD owner feels the difference with a heavy trailer hooked up. If you're trading in a recent Silverado HD, the cab will feel like home. Chevrolet lists a 13.4-inch touchscreen, a 12.3-inch driver display, available Google built-in with the Gemini assistant, and eight years of standard OnStar Basics. What replaced the 6.6L Duramax diesel? An 8.3L Duramax turbo-diesel V8 making 555 horsepower and 1,230 lb-ft of torque replaces the 6.6L Duramax, which made 470 horsepower and 975 lb-ft in the 2026 truck. That's 85 more horsepower and 255 more lb-ft. GM calls it its first clean-sheet heavy-duty V8 designed, developed and manufactured in-house, and rates its horsepower and torque best-in-class among diesels (GM's claim excludes other GM vehicles, since the GMC Sierra HD gets the same engine). It's built at GM's DMAX plant in Brookville, Ohio, and it's paired with an Allison 10-speed automatic. Maximum towing climbs from 36,000 pounds on the 2026 HD to 38,000 pounds with a gooseneck. The diesel is a $11,400 option on every 2500 HD trim. We'll go through the engine part by part in next week's post. Is the gas engine new too? The 6.6L gas V8 isn't all-new, but it's stronger: 412 horsepower and 472 lb-ft, up from 401 and 464. GM rates that 472 lb-ft as best-in-class standard torque among 2027 heavy-duty gas engines. The updates are mostly about durability and pulling from low rpm. There's a new intake manifold, a reworked lubrication system with an engine-mounted oil cooler, updated emissions hardware and a digital oil-level readout on the driver display. It's the standard engine on every 2500 HD trim, and it still runs through an Allison 10-speed. What changed with the steering and brakes? Both are new, and GM says each one is a first for the heavy-duty segment. Electric rack-and-pinion steering replaces the old hydraulic setup, and a system GM calls eBoost replaces the hydraulic brake assist. System What's new for 2027 Steering Electric power steering with about 30% more power than the current HD hydraulic gear, per GM. No pump, hoses or fluid. Full assist at any engine speed. Brakes eBoost electronic brake boost, larger 14.6-inch front rotors, new four-piston fixed front calipers, upgraded rear hardware, shorter pedal travel. Drive modes Tow/Haul tunes the engine, shifts, exhaust brake, grade braking, steering and brake boost for a load. New Terrain Mode on the ZR2 gives one-pedal off-road driving in 4HI and 4LO. One practical upside: steering and braking no longer share a single hydraulic source. GM also says the brake system can flag fade or a leak sooner, and it supports Adaptive Cruise Control and Automatic Emergency Braking. On a long pull over Lookout Pass with a camper behind you, steady assist and shorter pedal travel are the changes you'll notice. How much more does the 2027 Silverado 2500 HD cost? Announced 2500 HD pricing is $1,000 to $1,500 higher than 2026, depending on trim. The WT starts at $49,995 and the High Country at $78,195, both including the $2,795 destination charge. 2500 HD trim 2027 price with destination Increase vs 2026 MSRP WT $49,995 +$1,000 Custom $53,295 +$1,000 LT $56,695 +$1,000 LTZ $67,695 +$1,300 ZR2 $77,695 +$1,400 High Country $78,195 +$1,500 Those figures were reported by Autoblog, TFLtruck and CarBuzz; Chevrolet's own site hasn't posted MSRP yet. If price is the deciding factor, keep an eye on our new Chevrolet specials. 2027 Silverado 3500 HD pricing is not yet released. Are there any trim changes? The lineup is still six trims: WT, Custom, LT, LTZ, ZR2 and High Country. The one notable shuffle is the Trail Boss package, which Chevrolet now offers on the HD Custom for the first time. On the Custom, Trail Boss brings 20-inch wheels with BFGoodrich All-Terrain tires, the Z71 suspension package with twin-tube shocks, an Autotrac 2-speed transfer case and a Z71 skid plate. The ZR2 has a 1.5-inch lift, larger Multimatic DSSV dampers, rear e-locker and 35-inch mud-terrains, and picks up the new Terrain Mode. Trail Boss package pricing is not yet released, and Chevrolet hasn't confirmed whether the LT and LTZ keep a Trail Boss option for 2027. What hasn't Chevrolet announced yet? Quite a bit, so be wary of anyone quoting firm numbers on these: 3500 HD pricing Towing and payload for each cab, bed and axle setup Cab and bed configurations Fuel economy (HD pickups aren't EPA rated) Warranty terms for the 8.3L Duramax Full standard equipment by trim We'll update this post as GM publishes each one. Until then, the diesel's 38,000-pound gooseneck and 20,000-pound conventional maximums, and the gas engine's 19,000-pound maximum, are for properly equipped trucks, not what every truck on the lot is rated for. Talk to us about a 2027 Silverado HD GM expects the 2027 Silverado HD at dealers starting late 2026. Watch our new Silverado 2500 HD inventory for arrivals, or send the Knudtsen Chevrolet team a message with the trim, engine and trailer you have in mind. If a half-ton would cover your needs, compare it with the 2027 Silverado 1500. We're in Post Falls, a short drive from Coeur d'Alene and Spokane. Frequently Asked Questions What is the biggest change on the 2027 Silverado HD? The new 8.3L Duramax turbo-diesel V8, which makes 555 horsepower and 1,230 lb-ft of torque and replaces the 6.6L Duramax. Does the 2027 Silverado HD have a new body or interior? No. Chevrolet says the exterior may look familiar, and Edmunds reports the sheetmetal and interior carry over. The changes are in the engines, steering, brakes and trailering tech. How much did 2027 Silverado 2500 HD prices go up? Announced prices are $1,000 to $1,500 higher than 2026, depending on trim. The WT starts at $49,995 including the $2,795 destination charge. Is electric power steering a good idea on a heavy-duty truck? GM says its new system has about 30 percent more power than the hydraulic steering it replaces, gives full assist at any engine speed, has built-in redundancy and needs no pump, hoses or fluid. Is the Trail Boss available on the 2027 Silverado HD? Yes. Chevrolet offers the Trail Boss package on the HD Custom for the first time. Package pricing and LT or LTZ availability have not been released.