2027 GMC Sierra 1500: Complete Redesign Guide, New V8 Engines, Specs and What’s Different

The next-generation 2027 GMC Sierra 1500 is the biggest change the truck has seen in years, and the powertrain lineup is where it shows: two all-new small-block V8s, including a 6.6-liter producing 481 horsepower and a 5.7-liter producing 402 horsepower, plus an enhanced TurboMax four-cylinder and the returning 3.0L Duramax diesel. For truck buyers in Stuart and across the Treasure Coast, this is a generational shift rather than another year of incremental updates.

Ordering is open now, and the first trucks are expected at dealerships before the end of 2026. This guide covers what GMC has officially confirmed: the full trim lineup, every engine and where it lands, towing and payload by configuration, technology, pricing, and what is available at launch versus what arrives later in the model year.

The 2027 Sierra 1500 Lineup: Six Trims

GMC has confirmed the next-generation 2027 Sierra 1500 lineup consists of six distinct trims: Pro, Elevation, AT4, AT4X, Denali and Denali Ultimate. The ordering sequence matters as much as the lineup itself, because not everything is available on day one.

At launch, production is 100 percent Crew Cab, and 79 percent of the initial mix is AT4 or higher. Only three engines are orderable in that first phase: the 5.7L V8, the 6.6L V8 and the 3.0L Duramax diesel. The enhanced TurboMax four-cylinder and the Pro trim are both late availability and arrive in the second phase, which runs through 2027 and brings the remaining cab configurations with it.

Regular Cab and Double Cab availability will be announced as production expands. The AT4X AEV Edition is also late availability.

For a buyer in Martin County who wants a specific configuration, the practical takeaway is this: if you want a Crew Cab with a V8 or the diesel, you can order it now. If you specifically want a TurboMax, a Pro, or a cab style other than Crew, you are waiting until later in the model year.

The Engine Lineup: Two All-New V8s

The headline powertrain news is the arrival of two all-new small-block V8 engines alongside the enhanced TurboMax and the carryover Duramax diesel. GMC has published complete output figures for all four.

• The all-new 5.7L V8 (L76) produces 402 horsepower at 5,500 rpm and 428 lb-ft of torque at 4,300 rpm. It is the volume V8 of the lineup, standard on AT4 and Denali and available on Pro and Elevation, and it is also the maximum-towing engine in the range.
• The all-new 6.6L V8 (L78) produces 481 horsepower at 5,800 rpm and 501 lb-ft of torque at 4,000 rpm, making it the most powerful engine ever offered in a Sierra 1500. It is standard on Denali Ultimate and available on AT4X and Denali. One configuration detail buyers should know before ordering: the 6.6L is four-wheel drive only.
• The enhanced TurboMax (L4B) produces 350 horsepower at 5,200 rpm and 455 lb-ft of torque at 3,000 rpm. It is the standard engine on Pro and Elevation, though both the engine and the Pro trim are late availability rather than launch items.
• The 3.0L Duramax turbo-diesel I6 (LZ0) carries forward at 305 horsepower at 3,750 rpm and 495 lb-ft of torque at 2,750 rpm. It is standard on AT4X and available on every other trim in the lineup.

All four engines pair with a 10-speed automatic transmission. Both new V8s feature Dynamic Fuel Management, GM’s cylinder deactivation system, which remains part of the powertrain architecture rather than being removed for 2027.

Towing and Payload: Which Engine Actually Pulls the Most

The towing hierarchy in the 2027 Sierra does not follow the pattern buyers may expect, and the most powerful engine is not the one that tows the most.

The 5.7L V8 is the maximum-towing engine in the lineup, rated at 13,500 lbs in Double Cab 4WD with the Max Trailering Package, and 13,300 lbs in Crew Cab 4WD with the same package. If maximum tow capacity is your primary reason for buying a Sierra, the 5.7L is the engine to specify.

The 6.6L V8 is tuned for power rather than maximum tow rating and is rated at 9,400 lbs in Crew Cab 4WD. The Duramax diesel reaches 12,100 lbs in Crew Cab 4WD with the Max Trailering Package and adds the low-end torque and efficiency advantages that make a difference on long-haul towing. The TurboMax tops out at 9,400 lbs in Regular Cab 2WD, with 9,200 lbs in Crew Cab 2WD and 8,800 lbs in Crew Cab 4WD.

On payload, the TurboMax leads at 2,310 lbs in Regular Cab 2WD. The 5.7L V8 reaches 2,140 lbs in the same configuration, the Duramax 1,850 lbs in Crew Cab 2WD, and the 6.6L 1,450 lbs in Crew Cab 4WD. Confirm the door-jamb sticker on any specific truck, since payload varies with equipment.

For Martin County buyers towing center consoles, bay boats or utility trailers in the 4,000 to 7,000 lb range, every engine in the lineup covers that with reserve. The distinction only becomes decisive above 10,000 lbs, where the 5.7L with the Max Trailering Package and the Duramax are the two configurations that qualify.

Interior and Technology

The 2027 Sierra’s cabin is built around a 16.3-inch diagonal Premium GMC Infotainment System, which GMC describes as the largest in its class and which is standard on every trim in the lineup, Pro included. On every trim except Pro, the screen articulates to reveal a hidden storage compartment behind it. A 12.2-inch diagonal digital Driver Information Center sits in front of the driver.

A third display is available: an 11.5-inch front passenger screen with an articulating cover, standard on AT4X and Denali Ultimate and available on AT4 and Denali through the Technology Package.

Google Built-In remains the backbone of the system, with Google Maps, Google Assistant and the in-vehicle Play Store, standard for eight years. Wireless Apple CarPlay and wireless Android Auto are standard across the lineup, Pro included. Dual wireless smartphone charging with Apple MagSafe compatibility is standard on every trim except Pro.

On the interior itself, Denali offers three colorways: Terra Summit with Bright White accents, Twilight Harbor with Bright White accents, and After Dark/Sheer with Sapphire Blue accents, paired with 12-way power heated and ventilated front seats. Denali Ultimate moves to 14-way power front seats with lumbar and massage in Stealth Black with Bright White accents, adds a 16-speaker Bose Premium Series system with CenterPoint, Richbass woofer and AudioPilot, and a quad-outlet sport-mode-enabled active exhaust. AT4X gets its own Timber Mahogany with Bright White accents treatment, also with 14-way massaging front seats.

Super Cruise Availability

Super Cruise, GMC’s hands-free highway driving system, is standard on AT4, AT4X, Denali and Denali Ultimate for 2027 and available on Elevation as the Super Cruise Package. It is not offered on Pro.

The package includes three years of OnStar One service, which is what enables Super Cruise connectivity, plus Driver Attention Assist. On Elevation, the package requires Crew Cab, the Trailer Technology Package and the Active Safety II Package, so it is not a standalone option box.

For Treasure Coast buyers who run regular highway miles on I-95 or the Florida Turnpike, hands-free operation on compatible mapped roads is a meaningful difference on longer trips, and the system supports hands-free trailering.

Safety: Standard Across the Lineup

Sierra LD Pro Safety is standard on all trims and includes 15 safety and driver assistance features: Adaptive Cruise Control, Blind Zone Steering Assist, Enhanced Automatic Emergency Braking, Forward Collision Alert, Front and Rear Park Assist, HD Rear Vision Camera, IntelliBeam auto high beams, Intersection Automatic Emergency Braking, Lane Keep Assist with Lane Departure Warning, Rear Cross Traffic Braking, Rear Pedestrian Alert, Reverse Automatic Braking, Safety Alert Seat and Side Bicyclist Alert.

Several of those upgrade on higher trims. HD Rear Vision Camera is replaced by HD Surround Vision on AT4, AT4X, Denali and Denali Ultimate, and Blind Zone Steering Assist is replaced by Blind Zone Steering Assist with Trailering on the same trims. Both upgrades are available on Elevation.

2027 Sierra 1500 Pricing

GMC has confirmed starting MSRPs for the 4WD Crew Cab configuration, including the $2,795 destination freight charge. Pricing for other cab, box, drivetrain and package combinations will vary and has not yet been published.

Incentives, trade-in values and local market factors affect the final transaction price. Contact our team at Starling Buick GMC Stuart for configuration-specific quotes.

Off-Road: AT4 and AT4X

The AT4 comes standard with 34-inch all-terrain tires, a 2-inch factory off-road suspension lift with monotube shocks, an off-road performance display and a 3.23 rear axle ratio, along with the AT4-exclusive Forest Storm with Alpine Lake interior.

The AT4X goes further. It adds AT4X-exclusive 35-inch mud-terrain tires, the AT4X Off-Road Lifted Suspension Package with a 2-inch factory lift, Multimatic DSSV dampers and Multimatic Jounce Control Dampers, driver-selectable front and rear electronic locking differentials, an AT4X-exclusive Baja drive mode, the 34-gallon extended range fuel tank, skid plates and an engine block heater. It also carries a unique AT4X hood.

For buyers who access unpaved boat ramps, forest roads or beach areas, the AT4’s factory hardware covers that range. The AT4X’s locking differentials and Multimatic dampers matter for terrain where an open front differential would leave you stuck.

New Colors for 2027

Three exterior colors are new for the 2027 model year: Azurite Blue Metallic, Mesa Red and Dark Ridge Metallic. They join Coastal Dune, Glacier White Tricoat, Cardinal Red, Summit White, Onyx Black and Sterling Metallic. Availability varies by trim, with Glacier White Tricoat and Azurite Blue Metallic restricted to Denali and Denali Ultimate, and Cardinal Red limited to Pro, Elevation and Denali-tier interiors.

2027 vs 2026: Should You Order Now or Buy From Stock?

The timeline has moved faster than many buyers expect. Ordering is open, and the first 2027 trucks are expected at dealerships before the end of 2026, not in the spring.

The case for a 2026 is still straightforward. Inventory is on the ground, pricing is known, and the outgoing truck is a proven product with no first-model-year risk. Dealers are also working through 2026 inventory to make room, which affects effective transaction prices. If you need a truck in the next sixty days and the new powertrains are not a priority, the 2026 is a reasonable buy.

The case for the 2027 is the powertrain lineup, the 16.3-inch display standard across the range, and Super Cruise standard from AT4 upward. If you want a Crew Cab with a V8 or the diesel, you can order one now. If you want a TurboMax, a Pro trim, or a Regular or Double Cab, those are later in the model year and a 2026 may genuinely be the faster path to a truck in your driveway.

Order Your 2027 GMC Sierra 1500 at Starling Buick GMC Stuart

Starling Buick GMC Stuart serves truck buyers throughout Martin County, Palm Beach County and the Treasure Coast. Our team can walk through the trim and engine combinations that are orderable today versus the ones arriving later, and help you decide whether ordering a 2027 or buying from current 2026 inventory is the better move for your timeline.

We also have 2026 Sierra 1500 models in stock across multiple trims and powertrains, including Duramax diesel and Denali configurations. Visit us at 2445 SE Federal Hwy in Stuart or contact our sales team to start the conversation.

Conclusion

The next-generation 2027 GMC Sierra 1500 brings two all-new small-block V8s, the 402-horsepower 5.7L and the 481-horsepower 6.6L, alongside the enhanced 350-horsepower TurboMax and the 305-horsepower Duramax diesel. The 5.7L is the towing leader at 13,500 lbs. The 16.3-inch infotainment display is standard on every trim, and Super Cruise is standard from AT4 upward. Pricing runs from $51,295 for the Pro to $87,895 for the Denali Ultimate in 4WD Crew Cab form. Ordering is open now, with the first trucks arriving before the end of 2026 and the TurboMax, Pro trim and additional cab styles following later in the model year.

Frequently Asked Questions

How much horsepower does the 2027 Sierra 1500 have?

The 2027 Sierra 1500 offers four engines. The enhanced 2.7L TurboMax produces 350 horsepower and 455 lb-ft of torque. The all-new 5.7L V8 produces 402 horsepower and 428 lb-ft. The all-new 6.6L V8 produces 481 horsepower and 501 lb-ft, the most powerful engine offered in a Sierra 1500. The 3.0L Duramax turbo-diesel produces 305 horsepower and 495 lb-ft.

What is the maximum towing capacity of the 2027 Sierra 1500?

The 2027 Sierra 1500 tops out at 13,500 lbs, achieved with the 5.7L V8 in Double Cab 4WD with the Max Trailering Package. The same engine reaches 13,300 lbs in Crew Cab 4WD. The Duramax diesel reaches 12,100 lbs in Crew Cab 4WD with the Max Trailering Package. The 6.6L V8 is rated at 9,400 lbs in Crew Cab 4WD, and the TurboMax at 9,400 lbs in Regular Cab 2WD.

When does the 2027 GMC Sierra 1500 arrive at dealers?

Ordering is open now, and GMC expects the first 2027 Sierra 1500 models at dealerships before the end of 2026. Launch production is Crew Cab only with the 5.7L V8, 6.6L V8 and Duramax diesel. The enhanced TurboMax engine, the Pro trim, the AT4X AEV Edition and the Regular and Double Cab configurations follow later in the model year.

Which engine is standard on the 2027 Sierra AT4X?

The 3.0L Duramax turbo-diesel is the standard engine on the 2027 Sierra 1500 AT4X. The all-new 6.6L V8 is available on the AT4X as an option, in four-wheel drive only. This is a common point of confusion, since the 6.6L is the standard engine on the Denali Ultimate.

What screen size does the 2027 Sierra 1500 have?

The 2027 Sierra 1500 has a 16.3-inch diagonal infotainment display standard on every trim, which GMC describes as the largest in its class, paired with a 12.2-inch digital Driver Information Center. An 11.5-inch front passenger screen with an articulating cover is standard on AT4X and Denali Ultimate and available on AT4 and Denali.

Is Super Cruise available on the 2027 Sierra 1500?

Yes. Super Cruise is standard on the AT4, AT4X, Denali and Denali Ultimate trims and available on the Elevation as the Super Cruise Package, which includes three years of OnStar One service. It is not offered on the Pro trim. On the Elevation, the package requires Crew Cab, the Trailer Technology Package and the Active Safety II Package.

How much does the 2027 Sierra 1500 cost?

GMC has confirmed pricing for the 4WD Crew Cab configuration including the $2,795 destination freight charge. The Pro starts at $51,295, the Elevation at $59,995, the AT4 at $73,495, the Denali at $76,795, the AT4X at $85,495 and the Denali Ultimate at $87,895. Pricing for other cab, box and drivetrain combinations has not yet been published.