Quick Answer
The 2027 Chevrolet Silverado 2500 HD changes both engine codes, puts the Allison name on all three transmissions, makes adaptive cruise control standard on every trim, adds bicyclist detection to the braking system, drops the 17-inch wheel entirely, and raises the gross vehicle weight rating ceiling to 12,300 lb.
The 2027 Silverado 2500 HD is a refinement year, not a redesign, and the changes that matter are mostly on the order sheet rather than the sheet metal. Two of them genuinely change what you can build. One of them changes what we are able to tell you, because Chevrolet has published substantially less about this truck than it did about the 2026, and the honest thing to do is say exactly which numbers are missing rather than quietly reuse last year's.
By Lexy Tabbert, Director of Sales and Marketing, Beadle Chevrolet GMC
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New engine codes, and no published output
The Allison name on all three transmissions
Adaptive cruise standard on every trim
Bicyclist detection added to the braking system
Both Engine Codes Changed, and the Output Is Not Printed
The gas V8 and the Duramax both carry new order codes for 2027. The gas engine moves from the 2026 code to L8S, described as a V8 with direct injection and variable valve timing. The diesel moves to L6P, described as a Duramax turbo-diesel V8, B20-diesel compatible.
Here is the part that matters more than the codes: the 2027 guide prints no displacement, no horsepower and no torque for either engine. The 2026 guide printed all three on the engine row. The 2027 rows carry the description and nothing else.
A code change on its own does not mean an output change, and we are not going to tell you it does. What it does mean is that we cannot responsibly publish a 2027 horsepower figure by assuming the 2026 numbers carried over, because the code the figure belonged to no longer exists. If output is central to your decision, that is a genuine reason to wait for Chevrolet to publish rather than to order on an assumption.
One smaller change in the same area: E85 FlexFuel capability is gone for 2027. It was available on the 2026 Work Truck gas engine and does not appear anywhere in the 2027 material.
The Allison Name Is on All Three Transmissions
In 2026 the three ten-speed automatics in this truck were described simply as "10-Speed automatic". For 2027 all three are printed as "Allison 10-Speed automatic": the gas transmission, the diesel transmission, and the Power Take-Off version offered on the Work Truck, Custom and LT.
This is a naming change in the order guide rather than a documented hardware change, and we are describing it as exactly that. For a fleet buyer or an upfitter the Allison name carries weight on a spec sheet and in a tender document, which is a practical benefit even where the hardware conversation is unchanged.
The axle ratios are unchanged: 3.73 with the gas engine and 3.42 with the Duramax, each tied to its own engine.
Adaptive Cruise Control Is Now Standard on Every Trim
This is the single best change on the 2027 truck, and it is a large one.
In 2026, adaptive cruise control was optional on the Work Truck, Custom and LT, arrived inside the Technology Package on the ZR2, inside a convenience package on the LTZ, and was standard only on the High Country. For 2027 it is standard equipment on all six trims, and conventional cruise control has been removed from the lineup entirely.
The practical effect is biggest at the bottom of the ladder. A 2027 Work Truck, the plainest truck Chevrolet builds in this range, now has the feature that a 2026 buyer had to climb most of the way up the ladder to reach. For anyone putting highway miles behind a trailer, that is a real quality-of-life change on a fleet-spec truck.
There is a knock-on effect worth knowing. The Technology Package on the LTZ and High Country used to include adaptive cruise as part of its contents; for 2027 that line is removed from the package, because the feature is standard anyway. The package still carries the head-up display and the rear camera mirror, and it is still not offered on the Work Truck, Custom or LT.
Bicyclist Detection Added to the Braking System
The 2026 truck carried Front Pedestrian Braking as standard on all six trims. For 2027 that is replaced by Front Pedestrian and Bicyclist Braking under a new code, again standard on all six trims.
Everything else in the driver-assist set carries over unchanged and remains standard across the range: lane departure warning, following distance indicator, forward collision alert, automatic emergency braking and automatic high beams.
One consistency worth repeating, because it comes up on every comparison: Chevrolet does not give this content a bundle name on this truck. There is no named safety package to buy, because the features are individually standard. If you see a branded safety-suite name attached to a Silverado 2500 HD, it did not come from Chevrolet's own material.
The 17-Inch Wheel Is Gone Entirely
For 2027 the 17-inch wheel is eliminated from the Silverado 2500 HD and 18 inches becomes the floor across the whole lineup.
That sounds cosmetic and is not. In 2026 the Max Trailering Package required 18-inch or 20-inch wheels, which meant a 17-inch truck could not have it without a wheel change. For 2027 every truck in the lineup clears that prerequisite automatically.
It also means something less convenient: every 2026 gross vehicle weight rating and payload row that was tied to a 17-inch wheel no longer describes any truck you can order. There were a lot of those rows. What the 18-inch floor changes, wheel code by wheel code, is its own piece, including one new conflict on the Work Truck and LT.
The Rating Ceiling Moves to 12,300 Pounds
The gross vehicle weight rating menu is the one place the 2027 guide publishes hard numbers, and it has changed in both directions.
The menu shrinks from 30 codes to 18, because every 17-inch variant disappeared with the wheel. And the ceiling rises from 11,900 lb to 12,300 lb, on a Crew Cab long bed 4WD Duramax with the Max Trailering Package, properly equipped. The equivalent standard-bed Crew Cab rises too, from 11,750 lb to 12,150 lb. That is 400 lb of additional rating on both Max Trailering Crew Cab configurations.
The floor is unchanged: a lowered 10,000 lb rating is still available for operations that need to stay under a regulatory threshold, and Chevrolet still states plainly that it significantly decreases towing and payload.
A higher rating is not a published payload
Gross vehicle weight rating is the maximum the loaded truck may weigh. It is not payload, and it is not a trailer rating. A 400 lb increase in the ceiling does not entitle anyone to say the 2027 carries 400 lb more, because Chevrolet has not published a 2027 payload figure to add it to. That arithmetic is tempting and it is wrong.
What the 12,300 lb figure tells you and what it does not works through that distinction properly, with the whole 2027 menu as the example.
What Chevrolet Has Not Published, Said Plainly
This is the most useful section on the page, and most 2027 previews do not have one.
The 2027 Chevrolet order guide contains no towing tables, no payload tables, no specification pages and no dimension pages. The 2026 guide had all of them. That means every one of the following is not available for a 2027 truck:
- Conventional towing ratings
- Gooseneck and fifth-wheel ratings
- Gross combination weight ratings
- Payload and curb weight by configuration
- Bed and cab dimensions, turning circles, fuel capacity
- Horsepower, torque and displacement
We are not going to carry the 2026 numbers across and present them as 2027 figures. Both engine codes changed and the rating ceiling moved, which is exactly the circumstance in which carryover assumptions go wrong. Anyone publishing a 2027 Silverado 2500 HD tow rating today is either quoting the 2026 truck or quoting something that is not in Chevrolet's material.
Until Chevrolet publishes, there are two places to look. For planning purposes, the 2026 buyers guide is the nearest complete data set and is clearly labelled as the 2026 truck. For the truck you actually take delivery of, the trailering label in the driver door jamb is the final word, and on a 2027 it will be the first authoritative figure you see.
From the Beadle Chevrolet GMC Lot
The most common conversation we have about a new model year is somebody asking what it tows, and this year the honest answer is that Chevrolet has not said yet. People are usually relieved rather than annoyed by that, because the alternative is finding out at delivery that the number they planned around came from a different model year.
Should You Order a 2027 or Buy a 2026?
| The 2027 is worth it if | Skip it and buy a 2026 if |
|---|---|
| You want adaptive cruise on a Work Truck or Custom You want the higher rating ceiling on a Max Trailering Crew Cab The Allison name matters on your spec sheet You are ordering anyway and can wait You want bicyclist detection as standard |
You need published towing and payload figures to plan against You need a truck this season rather than next You want a trim or edition that does not return for 2027 You are financing against a truck you can see today |
How to Decide Between Model Years in Four Steps
- Ask whether you need a published rating. If your loaded trailer is anywhere near a ceiling, you need numbers, and only the 2026 has them today.
- Check whether the 2027 changes touch your build. Adaptive cruise on a Work Truck is a real gain; on a High Country it was already standard.
- Check the 17-inch question. If you were going to order 17-inch wheels, that choice no longer exists.
- Work backward from when you need the truck. An order is a lead time, and a calving or haying season is a hard deadline.
The full buy-now-or-order decision guide works through both sides properly.
Our Recommendation
For a Mobridge-area buyer speccing a Work Truck or Custom fleet unit, order the 2027. Standard adaptive cruise at that end of the ladder is the biggest single improvement in this model year, and a fleet build is an order anyway so the lead time costs you nothing. For anyone whose purchase depends on a published towing or payload figure, buy the rated 2026 that is on the lot and plan against numbers that actually exist.
Key Takeaways
Both engine codes changed for 2027, and the guide prints no displacement, horsepower or torque for either.
All three ten-speed automatics are now printed as Allison transmissions.
Adaptive cruise control is standard on all six trims and conventional cruise is gone; front braking now detects bicyclists as well as pedestrians.
The 17-inch wheel is eliminated, so every 2027 truck clears the Max Trailering 18-inch prerequisite and every 17-inch 2026 rating row stops applying.
The rating ceiling rises from 11,900 lb to 12,300 lb, properly equipped, but no 2027 towing or payload figure has been published at all.
Frequently Asked Questions
What is new on the 2027 Chevrolet Silverado 2500 HD?
New order codes for both the gas and diesel engines, the Allison name on all three ten-speed automatics, adaptive cruise control standard on every trim with conventional cruise removed, front braking that now detects bicyclists as well as pedestrians, the elimination of the 17-inch wheel, and a gross vehicle weight rating ceiling that rises from 11,900 lb to 12,300 lb, properly equipped.
How much does the 2027 Silverado 2500 HD tow?
Chevrolet has not published 2027 towing ratings. The 2027 order guide contains no towing tables, no payload tables and no specification pages. Because both engine codes changed and the rating ceiling moved, we will not present 2026 figures as 2027 figures. The door jamb label on the delivered truck will be the first authoritative number.
Is adaptive cruise control standard on a 2027 Silverado 2500 HD Work Truck?
Yes. For 2027 adaptive cruise control is standard on all six trims including the Work Truck, and conventional cruise control has been removed from the lineup. In 2026 it was optional on the Work Truck, Custom and LT and standard only on the High Country, so this is the biggest change at the fleet end of the ladder.
Does the higher 2027 gross vehicle weight rating mean more payload?
Not necessarily, and nobody can say yet. Gross vehicle weight rating is the maximum the loaded truck may weigh, not payload and not a trailer rating. The ceiling rose 400 lb on both Max Trailering Crew Cab configurations, but Chevrolet has published no 2027 payload figure to apply that to, so adding 400 lb to a 2026 payload number is not a valid calculation.
Quick Answers
Did the trims change?
No. Work Truck, Custom, LT, ZR2, LTZ and High Country all return.
Did the colors change?
No. The same nine colors carry over with nothing added and nothing dropped.
Is the Duramax still offered?
Yes, under a new order code, available on all six trims.
Is E85 still available?
No. FlexFuel capability does not appear in the 2027 material.
What is the smallest wheel I can order?
18 inches. The 17-inch wheel is gone.
Is there a named safety package?
No. The driver-assist content is individually standard, as it was in 2026.
Can I still order a lowered 10,000 lb rating?
Yes, and it still significantly reduces towing and payload.
Is the Multi-Flex tailgate still offered?
Yes, unchanged for 2027.
When will towing figures be published?
Chevrolet has not said. We will update these pages when they are.
Keep Researching
For everything confirmed about the 2027 truck in one place, read the 2027 Chevrolet Silverado 2500 HD buyers guide. For the last model year with complete published figures, read the 2026 buyers guide.
Buy a rated 2026 now, or order a 2027?
The 17-inch wheel is gone: what an 18-inch floor changes
12,300 pounds: what the 2027 rating tells you, and what it does not
My Take
Standard adaptive cruise on a Work Truck is the change I will actually talk about on the lot. It is the kind of thing that sounds minor in a press release and then turns a four-hour trip with a trailer into a different experience, and it has arrived on the trim that never used to get anything.
The part I feel strongly about is the missing numbers. It would be easy to reprint the 2026 towing tables with a 2027 heading, and plenty of pages will. I am not willing to, because both engine codes changed and the rating ceiling moved, and those are precisely the conditions where a carryover assumption bites somebody at a scale house.
If you are speccing a 2027, send me how you would build it and I will tell you what is confirmed and what is still open. Call or text us at 605-845-7277, or stop by 2200 US Hwy 12 in Mobridge.
Lexy Tabbert, Director of Sales and Marketing
Beadle Chevrolet GMC, Mobridge, SD
About the Author
Lexy Tabbert — Beadle Chevrolet GMC, Mobridge, SD
Lexy Tabbert is the Director of Sales and Marketing at Beadle Chevrolet GMC in Mobridge, South Dakota. She covers Chevrolet and GMC vehicles, trim comparisons, and buyer guidance — helping families, ranchers, and ag operators across the region find the right truck and configuration for their needs. Learn more about Lexy.