2027 GMC Sierra 1500: New V8 Engines, More Towing and a Completely New Truck

2027 GMC Sierra 1500: New V8 Engines, More Towing and a Completely New Truck

The 2027 GMC Sierra 1500 is entering a new generation, and GMC is making sure this isn’t simply another mid-cycle update.

For 2027, the Sierra 1500 gets an entirely new lineup of available V8 engines, an upgraded TurboMax, the returning 3.0L Duramax diesel, a redesigned interior and a major technology overhaul.

The biggest news may be what is happening under the hood.

GMC is introducing an all-new 5.7L sixth-generation Small Block V8 producing 402 horsepower and 428 lb-ft of torque.

There is also a new 6.6L naturally aspirated V8 producing 481 horsepower and 501 lb-ft of torque.

The 2.7L TurboMax isn’t going away either.

Instead, GMC has upgraded it to 350 horsepower and 455 lb-ft of torque.

And for buyers who want diesel power, the 3.0L Duramax continues with 305 horsepower and 495 lb-ft of torque.

Every 2027 Sierra 1500 engine is paired with a 10-speed automatic transmission.

But horsepower isn’t the only story here.

The new Sierra brings a redesigned cabin, a new infotainment system, expanded camera technology, available Super Cruise with trailering capability and six different trim levels.

So what does all of this mean for someone actually shopping for a 2027 GMC Sierra 1500?

Let’s break it down.

2027 GMC Sierra 1500 Engine and Towing Chart

Engine	Horsepower	Torque	Maximum Available Towing
2.7L TurboMax	350 hp	455 lb-ft	9,400 lbs
3.0L Duramax Diesel	305 hp	495 lb-ft	12,100 lbs
5.7L V8	402 hp	428 lb-ft	13,500 lbs
6.6L V8	481 hp	501 lb-ft	9,400 lbs

These are maximum configuration-dependent figures, not ratings that apply to every Sierra 1500.

The 13,500-pound maximum comes from a properly equipped Sierra with the new 5.7L V8, while the Duramax can reach 12,100 pounds in a properly configured 4WD Crew Cab with the required trailering equipment.

That distinction is important because a Sierra’s actual towing capacity depends on cab, drivetrain, axle ratio, equipment and trailering package.

The New 5.7L V8 Is a Big Deal

For many truck buyers, the new 5.7L V8 may be the most interesting engine in the entire lineup.

The sixth-generation 5.7L produces 402 horsepower and 428 lb-ft of torque.

But the important number for truck owners is the available 13,500-pound maximum trailering rating.

That puts the new 5.7L directly into serious towing territory for a half-ton pickup.

GMC has also given the new V8 a number of significant engineering changes.

The engine uses a higher compression ratio, larger throttle body, tuned intake manifold and a dual-fuel injection system combining direct and port injection.

GMC says the new engine is designed to provide improved performance and efficiency while moving the Sierra into a new generation of small-block V8 technology.

For somebody towing a travel trailer, boat or large utility trailer, the 5.7L could become one of the most interesting choices in the lineup.

The 6.6L V8 Brings 481 Horsepower

If 402 horsepower isn’t enough, GMC has another option.

The new 6.6L sixth-generation Small Block V8 produces 481 horsepower and 501 lb-ft of torque.

That makes it GMC’s most powerful naturally aspirated half-ton V8 ever.

It is also the largest-displacement V8 in the Sierra 1500 lineup.

Interestingly, the 6.6L isn’t the Sierra’s maximum-towing engine.

GMC lists maximum available trailering of 9,400 pounds for the 6.6L.

That’s because maximum towing isn’t determined by horsepower alone.

Engine weight, vehicle configuration, payload, axle ratings, suspension and other factors all play a role.

The 6.6L therefore looks more like the engine for buyers who want big naturally aspirated V8 power rather than simply chasing the highest towing number.

The TurboMax Gets More Power

The 2.7L TurboMax is also getting a significant upgrade for 2027.

The revised engine produces:

350 horsepower

455 lb-ft of torque

That’s an increase of 40 horsepower and 25 lb-ft compared with the current TurboMax engine.

GMC has upgraded the turbocharger, fuel injection system, thermal management and pistons.

The result is a smaller engine that now makes more horsepower and torque than the previous version.

Maximum towing is rated at 9,400 pounds in the right configuration.

For buyers who don’t need a V8 but still want substantial torque, the TurboMax could make a lot of sense.

It is also standard on the Sierra Pro and Elevation trims.

The 3.0L Duramax Is Still Here

The Duramax remains one of the most interesting engines available in the Sierra 1500.

For 2027, the 3.0L turbo-diesel produces:

305 horsepower

495 lb-ft of torque

That torque figure puts the diesel ahead of the TurboMax and 5.7L V8 in this lineup.

The Duramax also has a maximum available towing rating of 12,100 pounds when properly configured with four-wheel drive and the required Max Trailering equipment.

Another major advantage is range.

GMC says the available approximately 34-gallon fuel tank combined with the Duramax can provide more than 900 miles of available GM-estimated highway range.

That could make the Duramax particularly attractive to people who regularly take long highway trips or tow over long distances.

Which 2027 Sierra 1500 Engine Is Best for Towing?

This is where things get interesting.

The engine with the highest maximum towing number is the 5.7L V8, at up to 13,500 pounds.

The Duramax follows with up to 12,100 pounds.

The TurboMax reaches 9,400 pounds.

The 6.6L V8 is also rated up to 9,400 pounds in GMC’s published specifications.

But maximum towing isn’t necessarily the only thing that matters.

Someone towing a heavy travel trailer thousands of kilometres every year may value the Duramax’s diesel torque and highway range.

Someone who wants a traditional gas V8 may prefer the 5.7L.

Someone who wants a lot of naturally aspirated power may be interested in the 6.6L.

And someone who primarily uses the truck as a daily driver with occasional towing may find the TurboMax completely adequate.

The 2027 Sierra Gets a Completely New Interior

The exterior isn’t the only major change.

GMC has redesigned the Sierra’s cabin for 2027.

The centerpiece is a new 16.3-inch diagonal center infotainment screen.

The truck also gets a 12.2-inch Driver Information Center.

On certain models, buyers can add an 11.5-inch passenger infotainment display.

GMC says the available cabin provides more than 60 inches of combined digital displays.

The new infotainment system also incorporates Google built-in features, Google Maps, Google Play applications and Google Gemini.

Apple CarPlay and Android Auto remain integrated with the system.

The Sierra Is Getting More Trailering Technology

GMC has put considerable attention into towing technology for 2027.

The Sierra can be equipped with an extensive camera system offering up to 19 different views.

Available views include:

• Hitch View
• Transparent Trailer
• Rear Camera Mirror
• Cabin Glance
• Front underbody view
• Rear underbody view

The truck also gets an updated Trailering App.

Another interesting feature is GMC’s available Trailer Brake Gain Assistant, which is designed to help with trailer brake setup.

For people who actually use their trucks for towing, these features may be more useful than another small horsepower increase.

Super Cruise With Trailer Support

The 2027 Sierra also expands GMC’s Super Cruise availability.

Super Cruise with trailering capability is standard on AT4, AT4X, Denali and Denali Ultimate.

It is also available on the Elevation.

On equipped trucks, Super Cruise can perform automatic lane changes and turn-signal-initiated lane changes.

That makes the Sierra particularly interesting for people who spend long periods on the highway.

The system is designed to work with trailering capability, although drivers still need to follow the system’s operating requirements and remain responsible for the vehicle.

2027 Sierra AT4

The AT4 continues to be the Sierra for buyers who want off-road capability without giving up luxury.

For 2027, the AT4 comes standard with the 5.7L V8.

It also gets a factory-installed two-inch lift, 34-inch all-terrain tires and monotube shocks.

Super Cruise with trailering capability is standard.

The AT4 also includes 12-way power heated and ventilated front seats, a panoramic sunroof, Head-Up Display and Bose premium audio.

The Duramax is available on the AT4.

That combination could be particularly interesting for somebody who wants an off-road truck that can also serve as a long-distance towing machine.

2027 Sierra AT4X

The AT4X moves the Sierra further toward serious off-road territory.

It gets Multimatic DSSV shocks and more aggressive off-road hardware.

The AT4X also receives carbon-fiber interior details and additional off-road technology.

For buyers who want the Sierra to do more than simply drive down a gravel road, the AT4X is the truck to watch.

2027 Sierra Denali

The Denali continues to serve as the luxury-oriented Sierra.

The redesigned interior gives it a much more technology-heavy environment.

Available features include premium materials, advanced lighting, panoramic glass and Super Cruise.

The Denali can also be equipped with the Duramax diesel.

That combination gives buyers the ability to have a luxury pickup that can still handle serious towing duties.

2027 Sierra Denali Ultimate

At the top of the lineup is the Denali Ultimate.

The 2027 Denali Ultimate starts at $87,895 including destination freight charges, according to GMC’s announced pricing.

It comes standard with the new 6.6L V8.

The Denali Ultimate also includes:

• 14-way heated, ventilated and massaging front seats
• 16-speaker Bose audio
• 11.5-inch passenger display
• 16.3-inch articulating infotainment display
• 15-inch Head-Up Display
• Rear Camera Mirror
• Underbody cameras
• MultiPro Power Steps
• 22-inch wheels
• Super Cruise

It is essentially GMC’s answer to the idea of a luxury vehicle that happens to have a pickup bed.

2027 GMC Sierra 1500 Pricing

GMC has announced starting prices for the initial 2027 lineup.

Trim	Starting MSRP Including $2,795 DFC
Sierra Pro	$51,295
Sierra Elevation	$59,995
Sierra AT4	$73,495
Sierra AT4X	$85,495
Sierra Denali	$76,795
Sierra Denali Ultimate	$87,895

These are starting prices for specified configurations and do not represent the price of every possible cab, drivetrain or package combination.

GMC says Regular Cab, Double Cab and additional configurations will be announced as production expands.

The first 2027 Sierra 1500 models are expected to arrive at GMC dealerships before the end of the 2026 calendar year.

2027 GMC Sierra 1500 Buyer Decision Guide

Choosing the right Sierra isn’t simply about choosing the engine with the most horsepower.

Here’s how the lineup starts to make sense depending on how you plan to use the truck.

If You Tow a Large Travel Trailer

Look closely at the 5.7L V8.

It offers the Sierra’s highest maximum available towing rating of 13,500 pounds when properly equipped.

Just remember that the truck’s payload rating and the trailer’s loaded tongue weight are just as important as the advertised maximum towing number.

If You Tow Long Distances

The 3.0L Duramax deserves serious consideration.

Its 495 lb-ft of torque and available 34-gallon fuel tank make it particularly interesting for long highway trips.

GMC estimates more than 900 miles of available highway range with the appropriate configuration.

If You Want a Traditional V8

The 5.7L V8 is the middle ground.

It provides 402 horsepower, 428 lb-ft of torque and the highest maximum towing rating in the Sierra 1500 lineup.

If You Want Maximum Naturally Aspirated Power

The 6.6L V8 delivers 481 horsepower and 501 lb-ft of torque.

It isn’t the maximum-towing engine, but it provides the most naturally aspirated horsepower in the Sierra 1500 lineup.

If You Want a Smaller Engine With Strong Torque

The TurboMax is worth considering.

With 350 horsepower and 455 lb-ft of torque, it has enough output for many everyday towing and hauling jobs while avoiding the added size of a V8.

If Off-Road Driving Is the Priority

The AT4 or AT4X is where the Sierra lineup gets serious about off-road driving.

The AT4 provides a strong combination of off-road equipment and luxury.

The AT4X takes that formula considerably further with more specialized suspension hardware.

If Luxury Matters Most

The Denali or Denali Ultimate provides the most upscale Sierra experience.

The Denali Ultimate in particular adds premium materials, massaging seats, advanced displays, Super Cruise and extensive camera technology.

If This Is Primarily a Work Truck

Start with the Sierra Pro.

The Pro is designed around capability and value rather than luxury equipment.

The TurboMax is standard, while the 5.7L V8 and Duramax are available.

2027 GMC Sierra 1500 vs Silverado 1500

The Sierra 1500 and Silverado 1500 share GM’s new-generation powertrain technology.

Both receive the new 5.7L V8, 6.6L V8, upgraded TurboMax and 3.0L Duramax.

The major difference is how GMC and Silverado position their trucks.

The Sierra places more emphasis on premium materials, upscale interiors and luxury-oriented trims such as Denali and Denali Ultimate.

That makes the Sierra particularly interesting for buyers who want a truck that can function as both a work vehicle and a premium daily driver.

2027 GMC Sierra 1500 vs Ford F-150

The Ford F-150 continues to offer a wide range of engines and configurations.

The Sierra counters with its new 5.7L V8 and 13,500-pound maximum towing capability.

The GMC also has an important advantage for buyers interested in diesel power because the 3.0L Duramax remains available.

The decision between these trucks will ultimately come down to the specific configuration, towing requirements, engine preference, price and equipment.

2027 GMC Sierra 1500 vs Ram 1500

The Ram 1500 continues with its Hurricane inline-six engines and the returning HEMI V8 on select 2027 models.

The Sierra takes a different approach by offering two new naturally aspirated V8s alongside its TurboMax and Duramax.

That gives buyers a very broad choice of gas and diesel powertrains.

For traditional V8 buyers, the new Sierra should be particularly interesting.

Is the 2027 Sierra 1500 a Major Redesign?

Yes.

The 2027 Sierra 1500 represents a new generation rather than simply another equipment update.

GMC has redesigned the exterior, interior, powertrain lineup and technology systems.

The biggest mechanical changes are the new sixth-generation 5.7L and 6.6L V8 engines.

The TurboMax has also been substantially upgraded.

The cabin receives a new digital architecture, while trailering and camera technology have been expanded.

What Makes the 2027 Sierra 1500 Interesting?

The most interesting thing about the 2027 Sierra is the range of choices.

There isn’t one engine trying to do everything.

The TurboMax provides 350 horsepower and 455 lb-ft.

The 5.7L V8 provides 402 horsepower and up to 13,500 pounds of towing.

The Duramax delivers 495 lb-ft and up to 12,100 pounds of towing in the right configuration.

The 6.6L V8 provides 481 horsepower and 501 lb-ft.

That gives Sierra buyers four distinctly different ways to build their truck.

2027 GMC Sierra 1500 FAQs

The Bottom Line

The 2027 GMC Sierra 1500 is one of the most significant Sierra updates in years.

GMC isn’t simply changing the grille or adding another technology package.

The truck gets a new generation of V8 engines, an upgraded TurboMax, continued Duramax diesel power, a redesigned cabin and a major expansion of its trailering and camera technology.

The new 5.7L V8 is particularly important because it combines 402 horsepower with a maximum available 13,500-pound towing rating.

The Duramax remains an attractive choice for long-distance towing, while the 6.6L V8 gives buyers a powerful naturally aspirated alternative.

And then there is the TurboMax, which now produces 350 horsepower and 455 lb-ft of torque.

Add in Super Cruise with trailering capability, the new 16.3-inch infotainment system and the redesigned Denali and AT4 models, and the 2027 Sierra 1500 becomes much more than an engine update.

For truck buyers, the biggest question may no longer be whether the Sierra 1500 has enough power.

The bigger question is which version of the new Sierra makes the most sense for the way you actually use your truck.

Sources

official 2027 GMC Sierra 1500 specifications