2026 GMC Sierra 1500 Technical Specifications

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Full technical specifications for the 2026 GMC Sierra 1500. For broader coverage, see our 2026 Sierra 1500 research overview; for trims, see Sierra 1500 trim levels compared.

Engine and Powertrain Options

Four engines: a turbocharged I4, two V8s, and a turbo-diesel I6. Per GMC, the 2.7L TurboMax delivers best-in-class standard torque.

• 2.7L TurboMax Turbocharged I4: 310 hp, 430 lb-ft, 8-speed automatic.
• 5.3L EcoTec3 V8: 355 hp, 383 lb-ft, 10-speed automatic. Dynamic Fuel Management cylinder deactivation.
• 6.2L EcoTec3 V8: 420 hp, 460 lb-ft, 10-speed automatic. Dynamic Fuel Management cylinder deactivation.
• Duramax 3.0L Turbo-Diesel I6: 305 hp, 495 lb-ft, 10-speed automatic.

Pro, SLE, Elevation, SLT, and Denali are available in 2WD or 4WD. AT4, AT4X, and Denali Ultimate are 4WD only. AT4 includes a two-speed Autotrac transfer case; AT4X adds front and rear electronic locking differentials.

Exterior Dimensions

Three cab styles and three bed lengths produce five footprints. Cab availability isn't uniform: Regular Cab is offered only on Pro; Double Cab is offered on Pro, SLE, and Elevation; every other trim is Crew Cab only.

• Regular Cab, Standard Bed (6'6"): 210.97" length, 126.49" wheelbase.
• Regular Cab, Long Bed (8'2"): 229.73" length, 139.56" wheelbase.
• Double Cab, Standard Bed (6'6"): 231.94" length, 147.44" wheelbase.
• Crew Cab, Short Bed (5'8"): 231.92" length, 147.44" wheelbase.
• Crew Cab, Standard Bed (6'6"): 242.45" length, 157.04" wheelbase.
• Width without mirrors: 81.24" (Double Cab, Crew Cab); 81.15" (Regular Cab).
• Height: 75.7" on standard-suspension trims.
• Ground clearance: 7.88" front on standard trims; AT4 adds a factory 2" lift; AT4X adds further off-road geometry with Multimatic DSSV dampers.

Interior Dimensions

• Front headroom: 43.03"
• Front legroom: 44.53" (best-in-class for standard Crew Cab, per GMC)
• Front shoulder room: 64.54"
• Front hip room: 60.78"
• Crew Cab rear: 40.12" headroom, 43.40" legroom, 64.00" shoulder room
• Double Cab rear: 39.88" headroom, 35.24" legroom
• Seating: 3 in Regular Cab; 5–6 in Double Cab and Crew Cab depending on bucket seats vs. 40/20/40 bench

Capacity and Capability

• Max towing — 13,300 lbs when properly equipped (Double Cab 2WD, Standard Bed, Duramax, Max Trailering Package, 20" wheels).
• Max towing by engine: 2.7L TurboMax up to 9,500 lbs (2WD) / 9,400 lbs (4WD); 5.3L V8 up to 11,500 lbs; 6.2L V8 up to 13,000 lbs; Duramax up to 13,300 lbs. All require proper equipment.
• Max fifth-wheel/gooseneck: 9,900 lbs with Double Cab 2WD, Standard Bed, 5.3L V8, Max Trailering Package, and customer-installed hitch.
• Max payload: Regular Cab Std/Long Bed up to 2,230 lbs; Double Cab Std Bed up to 2,040 lbs; Crew Cab Short Bed up to 2,020 lbs; Crew Cab Std Bed up to 1,950 lbs. AT4X drops to roughly 1,350 lbs due to off-road hardware.
• Bed lengths: Short Bed 69.92" (5'8"); Standard Bed 79.44" (6'6"); Long Bed 98.27" (8'2"). Cargo box width at the floor is 71.4"; width between wheel housings is 50.62". Standard Bed cargo volume is 71.7 cu ft.
• Bed features: 12 fixed cargo tie-downs standard. Six-function MultiPro Tailgate available across most trims. CarbonPro composite bed available on Denali.

For a full tow-rating breakdown by cab, bed, and engine, see our towing capacity guide.

Wheels, Tires, and Brakes

• Pro and SLE: 17" or 18" wheels depending on configuration.
• Elevation: 20" gloss-black painted aluminum.
• SLT: 20" machined aluminum standard.
• AT4: 20" wheels with All-Terrain tires; 18" wheels with available 33" off-road mud-terrain tires.
• AT4X: 18" wheels with 33" mud-terrain tires standard.
• Denali: 20" machined aluminum standard; 22" available.
• Denali Ultimate: Exclusive 22" Ultra-Bright machined aluminum with Bright Chrome accents.
• Brakes: Four-wheel disc with four-channel ABS, electric parking brake, and trailer sway control — standard across the lineup.

Fuel Economy and Range

EPA-estimated MPG by engine and drivetrain:

• 2.7L TurboMax 2WD: 18 city / 21 highway / 20 combined
• 2.7L TurboMax 4WD: 17 / 20 / 18
• 5.3L V8 2WD: 17 / 20 / 19
• 5.3L V8 4WD: 15 / 20 / 17
• 6.2L V8 4WD: 14 / 19 / 16 (AT4X with mud-terrain tires runs roughly 14 / 16 / 15)
• 3.0L Duramax Turbo-Diesel 2WD: 23 / 28 / 25
• 3.0L Duramax Turbo-Diesel 4WD: 22 / 26 / 24

Fuel tank capacity is 24 gallons on most configurations; a 28-gallon tank is available on certain Crew Cab models. 2WD Duramax trucks routinely exceed 700 miles of highway range on a full tank.

Safety and Compliance

Every 2026 Sierra 1500 — Pro through Denali Ultimate — includes the GMC Pro Safety driver-assistance suite as standard:

• Automatic Emergency Braking
• Forward Collision Alert
• Front Pedestrian Braking
• Lane Keep Assist with Lane Departure Warning
• Following Distance Indicator
• IntelliBeam automatic high beams
• HD Rear Vision Camera
• Teen Driver mode
• StabiliTrak electronic stability control with trailer sway control
• Front seatbelt pretensioners, dual-stage frontal airbags, and head-curtain side airbags

Available driver-assistance upgrades: Adaptive Cruise Control, Rear Cross Traffic Alert, Blind Zone Steering Assist, and HD Surround Vision arrive via packages on SLE through Denali. Up to 14 camera views, Head-Up Display, and the ProGrade Trailering System with hitch guidance are available on SLT and above. Super Cruise hands-free driver assistance technology is available on Denali and standard on Denali Ultimate with a 3-year OnStar One plan.

Specifications FAQs

What is the horsepower and torque for each 2026 Sierra 1500 engine?

The 2.7L TurboMax produces 310 hp and 430 lb-ft. The 5.3L V8 produces 355 hp and 383 lb-ft. The 6.2L V8 produces 420 hp and 460 lb-ft. The Duramax 3.0L Turbo-Diesel produces 305 hp and 495 lb-ft. The TurboMax pairs with an 8-speed automatic; the other three engines pair with a 10-speed automatic.

How long is the 2026 Sierra 1500?

Overall length depends on cab and bed: Regular Cab Standard Bed is 210.97"; Regular Cab Long Bed is 229.73"; Double Cab Standard Bed is 231.94"; Crew Cab Short Bed is 231.92"; and Crew Cab Standard Bed is 242.45". Wheelbase ranges from 126.49" to 157.04" depending on configuration.

What is the maximum payload of the 2026 Sierra 1500?

Maximum payload is 2,230 lbs on Regular Cab Standard or Long Bed models. Double Cab Standard Bed tops out at 2,040 lbs, Crew Cab Short Bed at 2,020 lbs, and Crew Cab Standard Bed at 1,950 lbs. Payload varies by engine, drivetrain, and optional equipment; off-road trims like AT4X carry less due to added hardware.

What's the fuel economy of the 2026 Sierra 1500 diesel?

The Duramax 3.0L Turbo-Diesel earns EPA estimates of 23 city / 28 highway / 25 combined MPG with 2WD, and 22 / 26 / 24 with 4WD. It's the most fuel-efficient option in the lineup and currently the only half-ton diesel in its segment.

Is Super Cruise standard on the 2026 Sierra 1500?

Super Cruise hands-free driver assistance technology is standard on the Denali Ultimate (with a 3-year OnStar One plan) and available on the Denali. The remaining trims — Pro, SLE, Elevation, SLT, AT4, and AT4X — ship with the GMC Pro Safety suite, which doesn't include Super Cruise.

See the 2026 Sierra 1500 at Allen Tillery Buick GMC

Specs cover most of the questions; a test drive covers the rest. Allen Tillery Buick GMC has been the family-owned GMC dealer in Hot Springs, Arkansas since 1967, serving central and south Arkansas including Benton, Arkadelphia, and Texarkana. Visit us at 4573 Central Ave, call (501) 881-4160, or read the 2026 Sierra 1500 FAQs before stopping by.

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