2027 Silverado HD What Changed

Knudtsen Chevrolet› Blog› 8.3L Duramax vs 6.6L Gas: Which 2027 Silverado HD Engine Fits You Choose the 8.3L Duramax if you pull a fifth-wheel or gooseneck heavier than about 19,000 pounds, or tow long distances often; choose the 6.6L gas V8 if most of your weight rides in the bed, behind a plow or on a lighter bumper-pull trailer. The diesel costs $11,400 more on any 2027 Silverado 2500 HD. This guide walks through the numbers and the real-world jobs we hear about from truck buyers at Knudtsen Chevrolet in Post Falls. For background on each engine, read our 8.3L Duramax breakdown and our look at the updated 6.6L gas V8. The Silverado HD overview covers the rest of the truck. $11,400 Diesel option, any 2500 HD trim 20,000 lbs Diesel max conventional towing 19,000 lbs Gas max towing 6,990 lbs Gas max payload rating New Inventory Pre-owned Inventory New Vehicle Specials Contact Us Diesel or gas: what's the quick answer? Let the trailer decide. If it hitches in the bed and weighs more than the gas truck's 19,000-pound maximum, you need the diesel. Below that, the gas V8 is a legitimate choice and often the better value. Lean diesel if you... Pull a large fifth-wheel camper or a gooseneck stock or equipment trailer, put long highway miles on with a load, want the most torque for mountain grades, or need a dually rated for 30,000 pounds or more. Lean gas if you... Run a plow, carry heavy loads in the bed, tow a bumper-pull trailer a few weekends a year, or want the lowest purchase price on the trim you like. How do diesel and gas towing ratings compare? The gas V8's overall maximum of 19,000 pounds sits just 1,000 pounds under the diesel's conventional-hitch maximum of 20,000. The diesel pulls away with a gooseneck, where GM rates it up to 38,000 pounds. Rating 8.3L Duramax 6.6L gas V8 Max towing, any hitch 38,000 lbs (gooseneck) 19,000 lbs Max towing, conventional hitch 20,000 lbs Not published separately Max GCWR 46,500 lbs (select configs) Not yet released Dual-rear-wheel trucks 30,000+ lbs, every diesel dually Not yet released That's why we don't compare 38,000 to 19,000 as if they were the same kind of rating. Most buyers towing a bumper-pull trailer under 19,000 pounds are choosing between two engines that can both do the job, and the question becomes how the truck feels doing it and what it costs. Towing ratings for each 2500 HD and 3500 HD cab, bed, axle and drivetrain combination are not yet released. Every number above is a maximum for a properly equipped truck. Which engine has the higher maximum payload rating? Chevrolet's top payload rating is 6,990 pounds with the gas V8 and 6,170 pounds with the diesel, an 820-pound spread between the best configurations of each. That gap only tells you where the ceiling sits. Two specific trucks can land anywhere relative to each other depending on cab, bed and drivetrain, so the label on the door jamb is the number that counts. Still, if you load gravel, pallets or a slide-in camper more often than you hitch up, start your search with gas and let the label confirm it. Is the diesel worth $11,400? It is if you need the gooseneck rating or tow heavy on a regular schedule. For a WT, $11,400 is about 23% of the $49,995 starting price, which is a lot of money for capability you may use twice a year. The premium is flat across all six 2500 HD trims, from WT to High Country. If you'd rather spend that money on a nicer cab, compare the trims on our 2027 Silverado HD trim levels page before you settle on an engine. Fuel economy for both engines and the warranty terms for the 8.3L Duramax are not yet released, so a full cost-of-ownership comparison isn't possible yet. We'll add it when GM publishes the figures. Which engine fits common North Idaho jobs? Here's how we'd match each engine to common jobs we hear about, based on the published ratings. Job Our pick Why Big fifth-wheel camper over Fourth of July Pass 8.3L Duramax Highest towing ratings, 1,230 lb-ft for the climb, upgraded exhaust braking for the descent Gooseneck horse or stock trailer 8.3L Duramax Up to 38,000 lbs gooseneck on properly equipped trucks Equipment trailer, bumper-pull, under 19,000 lbs Either Gas max of 19,000 lbs vs diesel conventional max of 20,000 lbs Snow plow truck 6.6L gas Lower purchase price; confirm front axle rating with us Contractor hauling in the bed 6.6L gas Higher maximum payload rating Occasional boat or travel trailer 6.6L gas Plenty of capability without the $11,400 option Does the engine change anything else about the truck? Less than you'd think. Both engines run through an Allison 10-speed automatic, and GM's new electric power steering and eBoost brakes with 14.6-inch front rotors are part of the 2027 HD lineup regardless of what's under the hood. GM lists the trailering camera system, with up to 14 views including Transparent Trailer View, and trailer tire pressure and temperature monitoring as available on the 2027 HD without tying them to one engine. Gas trucks get a standard oil-level readout on the driver display. Diesels get GM's upgraded exhaust braking, which is the one feature here you'll appreciate most on I-90 heading down Lookout Pass with a full trailer. Get help choosing at Knudtsen Chevrolet Bring your trailer's weight and hitch type and we'll match you to the right engine and configuration. Shop new 2027 Silverado 2500 HD inventory or contact our Post Falls truck team with your numbers. Frequently Asked Questions Should I get the diesel or gas 2027 Silverado HD? Get the 8.3L Duramax for heavy fifth-wheel or gooseneck towing and frequent long tows. Get the 6.6L gas V8 for bed loads, plow duty or bumper-pull trailers under 19,000 pounds. How much more does the diesel Silverado HD cost? The 8.3L Duramax is an $11,400 option on every 2027 Silverado 2500 HD trim. A diesel WT comes to $61,395 including destination. Can the gas Silverado HD tow a fifth-wheel? It can tow up to 19,000 pounds when properly equipped. Heavier fifth-wheels and goosenecks call for the diesel, which GM rates up to 38,000 pounds with a gooseneck. Which Silverado HD engine has more payload? The gas V8 has the higher maximum payload rating, 6,990 pounds versus 6,170 pounds for the diesel. Payload for a specific truck depends on its configuration. Do the diesel and gas Silverado HD use the same transmission? Yes. Both are paired with an Allison 10-speed automatic.

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.