2025 GMC Sierra HD | Heavy-Duty Work Truck
The 2025 GMC Sierra HD lineup – including the Sierra 2500HD and 3500HD – is the heavy-duty workhorse of the GMC family, standing as the brawnier, more capable sibling to the popular Sierra 1500. Built with reinforced frames, upgraded running gear, and powerful engines, these trucks excel at towing and hauling, making them the ideal choice for demanding jobs.
However, the Sierra HD proves that toughness and luxury aren’t mutually exclusive. Buyers can configure the Sierra HD to suit their needs, from basic, no-frills work trucks to the ultra-luxurious Denali and Denali Ultimate trims, which bring features typically reserved for high-end sedans. These upscale models offer premium materials, advanced technology, and plush interiors, setting the Sierra HD apart from the Chevrolet Silverado HD, with which it shares much of its underpinnings.
Under the hood, the Sierra HD offers two impressive powertrain options:
• A 401-hp 6.6-liter V-8 gas engine, paired with a 10-speed automatic transmission, provides robust, reliable performance.
• For those tackling the heaviest loads, the 445-hp Duramax turbo-diesel V-8 is the go-to choice. Mated to a 10-speed automatic, this engine enables a maximum conventional towing capacity of 22,500 pounds. Opting for dual rear wheels and a gooseneck hitch pushes towing limits to a staggering 36,000 pounds.
In a segment dominated by heavy hitters like the Ram HD and Ford Super Duty, the GMC Sierra HD holds its ground as a highly capable and sophisticated option. Whether you’re hauling equipment to the job site or towing a trailer cross-country, the Sierra HD ensures that when the workday ends, comfort and refinement take the front seat.
Ready to experience the power and luxury of the 2025 Sierra HD? Visit your local GMC dealer or explore the lineup online to find the model that fits your lifestyle and workload.
However, the Sierra HD proves that toughness and luxury aren’t mutually exclusive. Buyers can configure the Sierra HD to suit their needs, from basic, no-frills work trucks to the ultra-luxurious Denali and Denali Ultimate trims, which bring features typically reserved for high-end sedans. These upscale models offer premium materials, advanced technology, and plush interiors, setting the Sierra HD apart from the Chevrolet Silverado HD, with which it shares much of its underpinnings.
Under the hood, the Sierra HD offers two impressive powertrain options:
• A 401-hp 6.6-liter V-8 gas engine, paired with a 10-speed automatic transmission, provides robust, reliable performance.
• For those tackling the heaviest loads, the 445-hp Duramax turbo-diesel V-8 is the go-to choice. Mated to a 10-speed automatic, this engine enables a maximum conventional towing capacity of 22,500 pounds. Opting for dual rear wheels and a gooseneck hitch pushes towing limits to a staggering 36,000 pounds.
In a segment dominated by heavy hitters like the Ram HD and Ford Super Duty, the GMC Sierra HD holds its ground as a highly capable and sophisticated option. Whether you’re hauling equipment to the job site or towing a trailer cross-country, the Sierra HD ensures that when the workday ends, comfort and refinement take the front seat.
Ready to experience the power and luxury of the 2025 Sierra HD? Visit your local GMC dealer or explore the lineup online to find the model that fits your lifestyle and workload.
Model Details
Engine, and Performance
The 2025 GMC Sierra HD continues to deliver exceptional power and versatility, making it a top contender in the heavy-duty truck segment. At the heart of its performance lineup is a standard 6.6-liter V-8 gas engine, producing 401 horsepower and 464 pound-feet of torque. Paired with a 10-speed automatic transmission and available in both rear- and four-wheel drive configurations, this engine provides reliable strength for towing and hauling tasks.
For those needing maximum power and towing capacity, the optional Duramax 6.6-liter turbo-diesel V-8 is the go-to choice. With 470 horsepower and a massive 975 pound-feet of torque, this engine, combined with an Allison-certified 10-speed automatic transmission, makes light work of even the heaviest loads. The Sierra 3500 HD models can also be equipped with a single- or dual-rear-wheel axle (dually) to further boost hauling capabilities.
In our experience, while the gas-powered version is dutiful and capable—similar to its twin, the Chevy Silverado 2500HD—the Duramax diesel truly shines. Its smooth yet powerful performance, responsive transmission, and refined handling make it the preferred option for those who tow heavy trailers regularly. When tested, the Sierra 2500HD Denali equipped with the Duramax delivered impressive acceleration, defying the expectations of its size.
Despite its substantial build, the Sierra HD offers surprisingly comfortable ride quality, with handling that feels more agile than many competitors in the heavy-duty space. However, steering can feel slightly vague at higher speeds.
For off-road enthusiasts, the AT4 and AT4X trims present a more rugged, trail-ready alternative to the chrome-laden models. These trims feature an off-road suspension, locking rear differential, and a bold, blacked-out design, ensuring the Sierra HD is ready to tackle rough terrain while maintaining its commanding presence.
Whether you're hauling, towing, or exploring off-road trails, the 2025 GMC Sierra HD offers the power, refinement, and capability to handle it all.
For those needing maximum power and towing capacity, the optional Duramax 6.6-liter turbo-diesel V-8 is the go-to choice. With 470 horsepower and a massive 975 pound-feet of torque, this engine, combined with an Allison-certified 10-speed automatic transmission, makes light work of even the heaviest loads. The Sierra 3500 HD models can also be equipped with a single- or dual-rear-wheel axle (dually) to further boost hauling capabilities.
In our experience, while the gas-powered version is dutiful and capable—similar to its twin, the Chevy Silverado 2500HD—the Duramax diesel truly shines. Its smooth yet powerful performance, responsive transmission, and refined handling make it the preferred option for those who tow heavy trailers regularly. When tested, the Sierra 2500HD Denali equipped with the Duramax delivered impressive acceleration, defying the expectations of its size.
Despite its substantial build, the Sierra HD offers surprisingly comfortable ride quality, with handling that feels more agile than many competitors in the heavy-duty space. However, steering can feel slightly vague at higher speeds.
For off-road enthusiasts, the AT4 and AT4X trims present a more rugged, trail-ready alternative to the chrome-laden models. These trims feature an off-road suspension, locking rear differential, and a bold, blacked-out design, ensuring the Sierra HD is ready to tackle rough terrain while maintaining its commanding presence.
Whether you're hauling, towing, or exploring off-road trails, the 2025 GMC Sierra HD offers the power, refinement, and capability to handle it all.
Payload, and Towing Capacity
The 2025 GMC Sierra HD flexes serious muscle when it comes to towing, with the Sierra 3500HD leading the pack by offering a maximum towing capacity of 36,000 pounds. To achieve this impressive figure, the truck must be equipped with the Duramax diesel engine, regular cab, rear-wheel drive, a dual-rear-wheel axle (dually), and a gooseneck hitch.
Opting for a fifth-wheel hitch reduces the Sierra 3500HD’s maximum towing capacity slightly to 32,000 pounds, but this still positions it as a formidable hauler in the heavy-duty segment.
For those who don't require dually capability, the Sierra 2500HD—available exclusively with a single-rear-wheel axle—can tow up to 22,500 pounds when properly configured.
Whether you're towing heavy equipment, large trailers, or recreational vehicles, the Sierra HD lineup delivers the power and stability to handle demanding jobs.
Opting for a fifth-wheel hitch reduces the Sierra 3500HD’s maximum towing capacity slightly to 32,000 pounds, but this still positions it as a formidable hauler in the heavy-duty segment.
For those who don't require dually capability, the Sierra 2500HD—available exclusively with a single-rear-wheel axle—can tow up to 22,500 pounds when properly configured.
Whether you're towing heavy equipment, large trailers, or recreational vehicles, the Sierra HD lineup delivers the power and stability to handle demanding jobs.
Interior, and Comfort
The 2025 GMC Sierra 2500HD and 3500HD offer a spacious and functional interior designed to balance practicality with modern convenience. The expansive dashboard features intuitive, user-friendly controls, making essential functions easily accessible. Most trims come with a split-folding front bench seat, but buyers can upgrade to bucket seats with a full center console for a more refined cabin layout.
The Sierra HD can also be equipped with a range of upscale features, including a head-up display, heated steering wheel, heated and ventilated front seats, and wireless phone charging. While these amenities enhance comfort, panel fit and material quality across the lineup are not as refined as some competitors. Although there are plenty of soft-touch surfaces and durable materials throughout, the Denali trim doesn't quite meet the luxury expectations set by the nameplate. However, the introduction of the Denali Ultimate trim takes things to the next level, with leather-wrapped interior accents, Paldao wood trim, and a microsuede headliner that adds a more premium touch.
Despite Ram offering more lavish interiors in their heavy-duty trucks, the Sierra HD shines in terms of practicality and versatility. The crew cab models provide generous passenger space and ample interior storage, with numerous cubby compartments for small-item organization. For cargo management, the Sierra HD’s standard and long cargo boxes feature integrated steps on both sides, along with corner steps on the rear bumper for easier bed access. Buyers can further customize the box with LED lighting, movable tie-downs, and a 120-volt outlet for added utility.
One of the Sierra HD’s standout features is the innovative MultiPro tailgate, which boasts six different positions that transform it into a work surface, bench, and more. It’s a practical enhancement that proves invaluable whether you’re at a job site or hosting a tailgate party.
The 2025 Sierra HD may not be the most luxurious heavy-duty truck on the market, but it delivers the durability, convenience, and thoughtful design that pickup buyers prioritize.
The Sierra HD can also be equipped with a range of upscale features, including a head-up display, heated steering wheel, heated and ventilated front seats, and wireless phone charging. While these amenities enhance comfort, panel fit and material quality across the lineup are not as refined as some competitors. Although there are plenty of soft-touch surfaces and durable materials throughout, the Denali trim doesn't quite meet the luxury expectations set by the nameplate. However, the introduction of the Denali Ultimate trim takes things to the next level, with leather-wrapped interior accents, Paldao wood trim, and a microsuede headliner that adds a more premium touch.
Despite Ram offering more lavish interiors in their heavy-duty trucks, the Sierra HD shines in terms of practicality and versatility. The crew cab models provide generous passenger space and ample interior storage, with numerous cubby compartments for small-item organization. For cargo management, the Sierra HD’s standard and long cargo boxes feature integrated steps on both sides, along with corner steps on the rear bumper for easier bed access. Buyers can further customize the box with LED lighting, movable tie-downs, and a 120-volt outlet for added utility.
One of the Sierra HD’s standout features is the innovative MultiPro tailgate, which boasts six different positions that transform it into a work surface, bench, and more. It’s a practical enhancement that proves invaluable whether you’re at a job site or hosting a tailgate party.
The 2025 Sierra HD may not be the most luxurious heavy-duty truck on the market, but it delivers the durability, convenience, and thoughtful design that pickup buyers prioritize.
Technology and Infotainment
The 2025 GMC Sierra HD offers a robust infotainment suite designed to keep drivers connected and entertained, no matter the job or journey. Apple CarPlay and Android Auto come standard on every Sierra HD, ensuring seamless smartphone integration. Base models keep things simple but functional, with the option to add features like a 120-volt outlet and a mobile hotspot for enhanced connectivity.
Most trims come equipped with an 8.0-inch touchscreen and additional charging ports, providing easy access to essential functions. Physical rotary knobs and buttons complement the digital interface, offering intuitive, driver-friendly controls even when wearing gloves.
For those seeking a more immersive experience, the Sierra HD can be upgraded with:
• Built-in navigation for real-time mapping
• Bose audio system for premium sound quality
• SiriusXM satellite radio
• Rear-seat entertainment system for passengers
The top-tier infotainment experience comes with the available 13.4-inch touchscreen, standard on Denali and Denali Ultimate trims. This expansive display features Google Built-in technology, split-screen navigation, and wireless Apple CarPlay and Android Auto compatibility, delivering a tech-forward experience that streamlines connectivity and usability.
For added functionality, GMC’s smartphone app allows remote control of trailer functions, while the infotainment system itself supports multiple trailer profiles, enabling users to track maintenance schedules and manage different towing setups effortlessly.
Whether you’re managing work tasks or entertaining passengers, the Sierra HD’s infotainment system ensures you stay connected and in control. Stop by your local AutoNation dealer to experience the technology firsthand or schedule a test drive today!
Most trims come equipped with an 8.0-inch touchscreen and additional charging ports, providing easy access to essential functions. Physical rotary knobs and buttons complement the digital interface, offering intuitive, driver-friendly controls even when wearing gloves.
For those seeking a more immersive experience, the Sierra HD can be upgraded with:
• Built-in navigation for real-time mapping
• Bose audio system for premium sound quality
• SiriusXM satellite radio
• Rear-seat entertainment system for passengers
The top-tier infotainment experience comes with the available 13.4-inch touchscreen, standard on Denali and Denali Ultimate trims. This expansive display features Google Built-in technology, split-screen navigation, and wireless Apple CarPlay and Android Auto compatibility, delivering a tech-forward experience that streamlines connectivity and usability.
For added functionality, GMC’s smartphone app allows remote control of trailer functions, while the infotainment system itself supports multiple trailer profiles, enabling users to track maintenance schedules and manage different towing setups effortlessly.
Whether you’re managing work tasks or entertaining passengers, the Sierra HD’s infotainment system ensures you stay connected and in control. Stop by your local AutoNation dealer to experience the technology firsthand or schedule a test drive today!
Safety Features
The 2025 GMC Sierra HD offers a suite of driver-assistance technologies designed to enhance safety and visibility, though not all features come standard across the lineup. While some heavy-duty rivals provide more extensive assistive tech, the Sierra HD stands out with its advanced camera system, offering up to 15 viewing modes. One standout feature is the "transparent" trailer view, which gives drivers the ability to virtually see through an attached trailer, simplifying maneuvering and boosting confidence when towing large loads.
For those prioritizing safety, the Sierra HD comes equipped with essential features, with additional advanced options available at higher trims.
Key Safety Features:
• Standard forward-collision warning and automated emergency braking
• Standard lane-departure warning
• Available blind-spot monitoring and rear cross-traffic alert
For more details about the Sierra HD’s crash-test results and comprehensive safety ratings, visit the National Highway Traffic Safety Administration (NHTSA) or Insurance Institute for Highway Safety (IIHS) websites.
The Sierra HD blends power and protection, making it a solid choice for drivers who need heavy-duty capability with a focus on safety. Contact our HENDERSON dealership to learn more about the Sierra HD’s safety technologies or to schedule a test drive.
For those prioritizing safety, the Sierra HD comes equipped with essential features, with additional advanced options available at higher trims.
Key Safety Features:
• Standard forward-collision warning and automated emergency braking
• Standard lane-departure warning
• Available blind-spot monitoring and rear cross-traffic alert
For more details about the Sierra HD’s crash-test results and comprehensive safety ratings, visit the National Highway Traffic Safety Administration (NHTSA) or Insurance Institute for Highway Safety (IIHS) websites.
The Sierra HD blends power and protection, making it a solid choice for drivers who need heavy-duty capability with a focus on safety. Contact our HENDERSON dealership to learn more about the Sierra HD’s safety technologies or to schedule a test drive.
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