GMC’s best-selling truck just got its biggest overhaul in nearly a decade. The 2027 Sierra 1500 is a ground-up redesign — new exterior, completely reworked interior, and two brand new V8 engines that replace the motors American truck buyers have relied on for years. If you’ve been waiting to buy a truck, this is the one worth waiting for.

A Decade in the Making

The current Sierra 1500 launched in 2019 and received a mid-cycle refresh in 2022. The 2027 model marks the first complete ground-up redesign in nearly a decade, and it shows. This isn’t a facelift or a new trim package — it’s a completely new truck from the ground up, riding on GM’s updated T1-2 platform shared with the redesigned Chevrolet Silverado. Motorious

The 2026 Sierra, still available now, closes out a well-proven generation. The 2027 is a generational leap — the kind of change most truck buyers keep for 6 to 10 years.

Two Brand New V8 Engines

This is the headline. The 2027 Sierra gets two new Gen 6 Small Block V8 engines — one displacing 5.7L and the other 6.6L, replacing the outgoing 5.3L and 6.2L motors that have been under the hood for years. Hagerty Media

The 5.7L V8 replaces the 355 horsepower 5.3L and is rumored to make around 400 horsepower. The 6.6L V8 replaces the 420 horsepower 6.2L and is rumored to put out roughly 475 horsepower — which would put it squarely in F-150 territory and well above where the current Sierra tops out. Motorious

GMC won’t release full specs of the 5.7L or 6.6L V8s until later this year, but the direction is clear: more displacement, more power, and better fuel economy than the outgoing engines. The TurboMax 2.7L four-cylinder and the 3.0L Duramax diesel carry over alongside the new V8s, giving buyers four powertrain options. TopSpeed

GM has taken concrete steps to substantially improve the quality of these V8 engines by bringing the engineering and manufacturing of key components in-house — a notable move that suggests GM is treating this engine family as a long-term foundation, not a stopgap. Motorious

An Interior That Finally Matches the Price Tag

The inside story is just as significant as what’s under the hood. The redesigned interior features over 60 inches of combined screens across multiple displays — a 16.3-inch center touchscreen, a 12.2-inch driver display, and an available 11.5-inch passenger screen.

The Denali Ultimate — GMC’s flagship trim — will feature articulating infotainment and passenger screens, a 12.2-inch driver display, a 15.0-inch head-up display, an 8.5-inch digital rearview mirror, a 16-speaker Bose Premium Series audio system, a three-year subscription to Super Cruise, and forged wood accents. TopSpeed

That’s a luxury truck interior by any standard. The gap between a Denali Ultimate and a European luxury SUV has never been smaller.

Super Cruise Gets Bigger

Super Cruise with Trailering is expanded across more of the Sierra lineup than ever before. For anyone who’s used hands-free driving on long highway hauls — especially while towing — this is a meaningful upgrade. The system has matured significantly since its debut, and spreading it further down the trim ladder makes it accessible to a much wider range of buyers.

Six Trims, Clear Identity

The 2027 Sierra 1500 will be offered in six trims with color schemes and materials helping each one stand out. The Denali and AT4 lines are expected to continue as the premium and off-road flagships respectively, with the Denali Ultimate sitting at the very top of the lineup.

When Can You Get One?

Production is set to start during the fourth quarter of 2026, either in late October or early November. That means the first trucks should reach dealers in late 2026 or early 2027. Pricing hasn’t been announced yet — the 2026 Sierra starts at $41,095 including destination, with the AT4X and Denali Ultimate in the mid-$80,000 range. Expect modest increases on the new generation. MotoriousHowStuffWorks

Worth Waiting For?

New V8 engines, a luxury interior, expanded driver assistance, and a complete exterior redesign — the 2027 Sierra is not an incremental update. For anyone in the market for a half-ton truck, the question isn’t whether the 2027 Sierra is impressive. The question is whether you need a truck now or can wait a few months.

If you can wait — wait.