2027 GMC SierreThe 2027 GMC Sierra 1500 arrives with a new lineup, two fresh V8 engines, and a top off-road trim that finally gets 35-inch tires and a diesel from the factory. If you are trying to figure out where your money goes across the range, the short answer is this: the truck starts at $39,300and climbs to an $87,895 MSRP for the Denali Ultimate Crew Cab 4WD, with destination and freight included. Every published price so far applies to Crew Cab 4WD, and all figures include a $2,795 destination charge. Regular Cab and Double Cab pricing comes later. For wheelers, the headline trim is the AT4X, which now carries 35-inch mud-terrain tires, front and rear e-locking differentials, and Multimatic dampers as standard equipment. Those three pieces of hardware are what let the Sierra clear terrain the lesser trims cannot. The rest of this guide breaks down each trim, what it costs, and what capability or gear you get in return.What the base Sierra 1500 Pro gets youThe work-focused Pro anchors the lineup. In Crew Cab 4WD form it starts at $51,295, which is $1,000 more than the 2026 model. Its standard powertrain is the 2.7L turbocharged four-cylinder, an enhanced version of GM's TurboMax engine paired with a 10-speed automatic. That four-cylinder puts out 350 horsepoweralong with 455 pound-feet, a torque figure that tows and pulls harder than the small displacement suggests. The Pro comes ready for hauling and towing rather than trail work. It includes a Trailering Package, Adaptive Cruise Control, and an HD Rear Vision Camera. Inside, you get a 40/20/40 front bench with under-seat storage, standard vinyl seating with cloth optional, a 16.3-inch infotainment screen, and a 12.2-inch Driver Information Center.Elevation: the value step upThe Elevation moves the Sierra into more comfortable territory while keeping the price reasonable. It starts at $59,995, just $600 more than the outgoing version. It runs the same 2.7L TurboMax four-cylinder and 10-speed automatic as the Pro. What you gain here is convenience and a bit of style. The Elevation adds dual wireless charging, heated front seats and a heated steering wheel, a 10-way power driver seat, and a MultiPro Tailgate that includes four fresh built-in tie downs. The 16.3-inch infotainment screen articulates and hides a storage compartment behind it. It is the most affordable Sierra that starts to feel modern inside.AT4 and AT4X: the off-road pairThe two AT4 trims are where trail capability lives. The AT4 starts at $73,495, a jump of $2,700 over the 2026 truck. It steps up to the new naturally aspirated 5.7L V8, coded L76, which produces 402 horsepower and 428 pound-feet and replaces the old 5.3L V8. Off-road hardware includes a 2-inch factory lift with monotube shocks, 34-inch all-terrain tires, and an auto-locking rear differential. You also get Super Cruise hands-free assistance with trailering capability and a flat-bottom steering wheel. The AT4X is the serious build. It starts at $85,495, which is $3,100 more than the 2026 model, and it sits above the AT4 in the lineup. Its standard engine is the segment-exclusive 3.0L Duramax turbo-diesel, the LZ0 held over from the earlier generation, rated at 305 horsepower and 495 pound-feet. That diesel torque is exactly what you want for low-speed crawling and loaded overland travel. The AT4X hardware list is the reason to buy one. It rolls on 35-inch mud-terrain tires, a 2-inch factory lift, and both Multimatic DSSV and Multimatic Jounce Control dampers. It carries e-locking differentials at both axles, along with a Baja Drive Mode exclusive to the AT4X and underbody cameras with forward- and rearward-facing views beneath the truck.What the 35-inch tires actually changeBigger tires are the same lever the Ford F-150 Raptor uses and the same upgrade the 2027 Chevy Silverado 1500 ZR2is set to gain. Going from the AT4's 34-inch all-terrains to the AT4X's 35-inch mud-terrains raises the belly of the truck and sharpens the geometry at both bumpers. On a rocky trail, that extra clearance and a better breakover angle mean fewer high-centers and less scraping over ledges. The Multimatic dampers matter just as much. The DSSV shocks and the jounce control dampers are part of the AT4X's trail-focused suspension tuning. Combined with lockers front and rear, the AT4X is built to keep all four tires driving through terrain that would leave an open-diff truck spinning.Denali and Denali Ultimate: the luxury endIf your priority is comfort over crawling, the Denali trims top the price sheet. The Denali starts at $76,795, which is $4,105 more than before. It uses the 5.7L V8 L76 and adds Denali Premium Suspension with Adaptive Ride Control, 12-way power front seats with heating and ventilation, a 15-inch Head-Up Display, and a panoramic sunroof. The Denali Ultimate crowns the lineup at $87,895, $1,705 above the 2026 version. It runs the 6.6L V8 L78, a direct replacement for the old 6.2L V8 that makes 481 horsepower and 501 pound-feet, and no rival fields a stronger naturally aspirated V8. The cabin brings 14-way front seats with heating, ventilation, and massage, a 16-speaker Bose Premium system, 22-inch wheels, and more than five feet of combined display area across the dash.How the new engines fit togetherThe 2027 Sierra debuts two sixth-generation Small Block V8 engines in 5.7L and 6.6L displacements, both with a new fuel injection system and advances in combustion and cooling. Every engine, including the four-cylinder and the diesel, pairs with the 10-speed automatic. At the top, the Sierra offers 481 horsepower and 501 pound-feet, and the truck can tow up to 13,500 pounds. One caveat: GMC has said that detailed technical specs for each engine will come later. Treat the exact AT4 figure as provisional until GMC finalizes it.Choosing your SierraFor a dedicated wheeling or overland rig, the AT4X is the only trim that gives you the diesel, 35s, dual lockers, and Multimatic damping without aftermarket work, and its price premium buys hardware you would otherwise pay to install and warranty separately. If you mostly run gravel roads and mild trails, the AT4 with its 2-inch lift and 34-inch tires covers real ground at a lower entry point. Check the final published spec sheet when the first units reach dealers to confirm engine numbers and the AT4 price before you commit.