New 5.7L and 6.6L V8s, with some engines assembled in St. Catharines, Ontario
Simplified six-trim lineup, with SLE and SLT removed
More standard tech, including larger screens, Super Cruise availability and upgraded off-road hardware
2027 GMC Sierra 1500 AT4X | Photo: GMCNew 5.7L and 6.6L V8 Engines
The familiar 5.3-litre and 6.2-litre V8s are being replaced by new 5.7-litre and 6.6-litre engines.
The 5.7 produces 402 horsepower and 428 lb-ft of torque, while the 6.6 delivers 481 horsepower and 501 lb-ft. GMC says the new engines feature revised combustion, cooling and fuel-injection systems aimed at improving performance and refinement.
The enhanced TurboMax four-cylinder also gets more power, now producing 350 horsepower and 455 lb-ft, while the 3.0-litre Duramax diesel continues with 305 horsepower and 495 lb-ft.
Despite its smaller displacement, the 5.7-litre V8 is the towing leader of the lineup. Properly equipped, it can pull up to 13,500 lb (6,123 kg), while the larger 6.6-litre V8 is rated at up to 9,400 lb (4,264 kg).
Every 2027 Sierra engine is now paired with a 10-speed automatic transmission.
2027 GMC Sierra 1500 | Photo: GMCFewer Trims, More Standard Equipment
| Trim | 2027 MSRP | What Changes for 2027 | Compared With 2026 |
|---|---|---|---|
| Pro | $53,899 | Enhanced TurboMax, 10-speed automatic, 16.3-inch infotainment screen, 12.2-inch digital cluster, expanded 10-feature safety suite, trailer brake controller and hitch guidance, dual 120V outlets and LED lighting become standard. | One of the biggest equipment jumps. The 2026 Pro uses the 310-hp TurboMax with an 8-speed automatic and has a much more basic standard equipment list. |
| Elevation | $67,199 | Enhanced TurboMax and 10-speed automatic, bucket seats, articulating 16.3-inch display, MultiPro centre console, dual MagSafe chargers, MultiPro tailgate, adaptive cruise control and ambient lighting. Super Cruise becomes available. | Elevation remains in the lineup, but considerably more equipment becomes standard. The 2026 model uses the TurboMax with an 8-speed automatic as standard. |
| AT4 | $89,399 | New 5.7L V8, Super Cruise with trailering capability, 34-inch all-terrain tires instead of 32s, 12-way heated and ventilated seats, head-up display, off-road display and dynamic ambient lighting. | The 2026 Canadian AT4 comes standard with the 3.0L Duramax, with the 6.2L V8 available. The 2027 model shifts its standard powertrain to the new V8 while retaining its two-inch factory lift. |
| AT4X | $109,599 | 35-inch mud-terrain tires instead of 33s, Multimatic Jounce Control Dampers, 11.5-inch passenger display, 16-speaker Bose audio with headrest speakers, panoramic roof, Super Cruise, underbody cameras, Baja Mode and a 129-litre (34-gallon) fuel tank. The 6.6L V8 is available. | The current AT4X already includes Multimatic DSSV dampers and front and rear electronic lockers, but the 2027 truck adds larger tires and more serious off-road hardware. |
| Denali | $96,599 | New 5.7L V8, Enhanced Super Cruise with trailering, three interior colourways, revised Denali suspension, panoramic roof, dynamic ambient lighting, My Mode, Rear Camera Mirror and head-up display. The 6.6L V8 is available. | The current Denali starts with the 5.3L V8, with the 6.2L and Duramax available. The new 5.7L therefore represents a significant standard powertrain upgrade. |
| Denali Ultimate | $115,599 | 6.6L V8 standard, 129-litre fuel tank, 11.5-inch passenger display, 16-speaker Bose audio with headrest speakers, panoramic roof, Enhanced Super Cruise, configurable ambient lighting and illuminated GMC badge. | The new 6.6L replaces the current standard 6.2L V8, while available digital display space grows from roughly 40 inches to more than 60 inches. |
GMC is also simplifying the Sierra lineup. The SLE and SLT disappear for 2027, leaving six trims: Pro, Elevation, AT4, AT4X, Denali and Denali Ultimate.
The idea is straightforward. GMC says Canadian buyers were already frequently adding many of these features, so the company has made more of them standard.
More Than 60 Inches of Available Displays
The interior is also completely new.
On Denali Ultimate, GMC says the Sierra can offer more than 60 inches of combined digital displays, including a 16.3-inch centre screen, 11.5-inch passenger display, 12.2-inch digital instrument cluster, 15-inch head-up display and 8.5-inch Rear Camera Mirror.
The new centre screen can also articulate to reveal additional storage behind it, while GMC’s new MultiPro centre console can open into an extended work surface.
GM Keeps Apple CarPlay in 2027 Chevrolet Silverado, GMC Sierra
Canadian pricing starts at $53,899 for the Pro, or $57,470 once freight, A/C tax, dealer fees and other listed charges are included. At the other end of the lineup, the Denali Ultimate starts at $115,599, with GMC listing a total price of $119,665 before applicable sales taxes.
