This page covers the complete technical specifications for the 2026 GMC Sierra 1500 as sold at Covert Buick GMC in Austin. For a plain-language overview of the truck, see the 2026 Sierra 1500 overview. For a trim-by-trim breakdown with pricing and comparisons, see the all-trims comparison, and for the full towing detail by configuration, see the towing capacity page.

Engine Specifications

The 2.7L TurboMax is the standard engine on the Pro, SLE, and Elevation. The 6.2L V8 pairs with four-wheel drive and is the standard engine on the Denali Ultimate. The Duramax diesel is the standard engine on the AT4 and AT4X and can be ordered on every trim except the Pro.

Exterior Dimensions

• Height: about 75.7 in on standard trims, taller on the AT4 and AT4X with the 2-inch factory lift.
• Ground clearance: 7.88 in at the front on standard trims. The AT4 adds a 2-inch lift, and the AT4X adds Multimatic DSSV dampers and additional off-road geometry for steeper approach and departure angles.

Interior Dimensions

The Crew Cab is the choice for back-seat passenger room, with 43.4 inches of second-row legroom against 35.2 inches in the Double Cab. Front-seat space is the same across cabs.

Capacity and Capability

Bed dimensions (length at the floor and cargo volume):

• Short bed: 69.92 in, about 62.9 cu ft.
• Standard bed: 79.44 in, 71.7 cu ft.
• Long bed (Regular Cab Pro only): 98.27 in, about 89.1 cu ft.
• Bed width: 71.40 in at the floor, 50.63 in between the wheelhousings, with 22.4-inch sidewalls.

Towing (properly equipped):

• 3.0L Duramax diesel: up to 13,300 lbs (Double Cab 2WD Standard Bed with the Max Trailering Package).
• 6.2L V8: up to 13,100 lbs.
• 5.3L V8: up to 11,200 lbs.
• 2.7L TurboMax: up to 9,400 lbs.
• Maximum fifth-wheel and gooseneck: up to 9,900 lbs.

Payload (varies by configuration):

• Regular Cab: up to 2,230 lbs (lineup maximum).
• Double Cab, Standard bed: up to 2,040 lbs.
• Crew Cab, Short bed: up to 2,020 lbs.
• Crew Cab, Standard bed: up to 1,950 lbs.
• AT4X: about 1,350 lbs, since the off-road hardware reduces payload.

Wheels, Tires, and Brakes

• Wheels: 17-inch steel on the Pro, ranging up to 20-inch on the Elevation and 22-inch on the Denali and Denali Ultimate.
• Tires: the AT4 and AT4X run all-terrain tires; other trims use highway and all-season tires sized to the wheel.
• Brakes: four-wheel disc brakes with anti-lock braking are standard across the lineup.

Fuel Economy and Range

• Fuel tank: 24 gallons standard, with a 28-gallon tank available on certain Crew Cab models.
• Range: a 2WD Duramax routinely exceeds 700 miles of highway range on a tank.

Safety and Compliance

The GMC Pro Safety suite is standard on every Sierra 1500 trim: automatic emergency braking, forward collision alert, lane keep assist with lane departure warning, front pedestrian braking, a following distance indicator, and IntelliBeam automatic high beams. The truck earns a 5-star overall safety rating from the NHTSA.

Available driver assistance on the higher trims includes lane change alert with side blind zone alert, rear cross traffic braking, front and rear park assist, HD Surround Vision, and adaptive cruise control. GMC Super Cruise hands-free driving is available on the Denali and standard on the Denali Ultimate.

2026 Sierra 1500 Specifications FAQs

How long is the 2026 GMC Sierra 1500?

Length runs from 210.97 inches for a Regular Cab Standard Bed to 242.45 inches for a Crew Cab Standard Bed. Width is about 81.2 inches without mirrors, and height is roughly 75.7 inches on standard trims.

How much can the 2026 Sierra 1500 carry?

Maximum payload is up to 2,230 lbs in a Regular Cab. Crew Cab models carry up to about 2,020 lbs with the short bed and 1,950 lbs with the standard bed, and the off-road AT4X is rated near 1,350 lbs.

What are the bed lengths on the 2026 Sierra 1500?

The short bed measures 69.92 inches, the standard bed measures 79.44 inches, and the long bed measures 98.27 inches. The long bed is offered only on the Regular Cab Pro.

What is the fuel tank size and driving range?

The standard fuel tank holds 24 gallons, and a 28-gallon tank is available on certain Crew Cab models. A 2WD Duramax diesel routinely exceeds 700 miles of highway range on a single tank.

How much horsepower does the 2026 Sierra 1500 have?

Output ranges from 305 horsepower in the Duramax diesel to 420 horsepower in the 6.2L V8. The 2.7L TurboMax makes 310 horsepower and the 5.3L V8 makes 355 horsepower.

Covert Buick GMC Bee Cave keeps the 2026 Sierra 1500 in stock across these configurations in Austin, and the team serves buyers from Killeen, Temple, Luling, and across the Central Texas region. Call (512) 954-9290 or browse the Sierra 1500 inventory to match a spec sheet to a truck on the lot in Austin.

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