2025 GMC Sierra Heavy Duty
The 2025 GMC Sierra Heavy Duty offers unmatched power and capability and now includes trailer-brake controller standard across all trims. Each trim has had its tech and equipment refreshed, featuring a number of upgrades sure to please even the pickiest driver. The 2025 GMC Sierra Heavy Duty is available in seven unique trims, although which you choose will vary based on your power demands as well as your craving for luxury. This comprehensive guide, put together by the team at Circle Buick GMC Hummer EV, is designed to help you choose which 2025 GMC Sierra Heavy Duty model is the right fit for you!
2025 GMC Sierra Heavy Duty Unmatched Performance
You have two engines to choose from for your 2025 GMC Sierra Heavy Duty: a 6.6L V8 gas engine and a 6.6L Duramax Turbo-Diesel V8 engine. Not sure which to choose? Check out the table below to see which engine best matches your specific priorities. Keep in mind that in trucks this size fuel economy factors in more than just engine! Body size, bed length, and more all contribute to your fuel economy.
| Engine Configuration 1 | Horsepower | Torque | Towing Capacity |
|---|---|---|---|
| 6.6L V8 gas with 10-speed automatic | 401 | 464 lb-ft | 16,000 lbs |
| 6.6L Duramax Turbo-Diesel V8 with 10-speed Allison certified automatic | 470 | 975 lb-ft | 21,870 lbs (2500HD) 36,000 lbs (3500HD) |
2025 GMC Sierra Heavy Duty Trim Levels
The 2025 GMC Sierra Heavy Duty comes in seven unique trim levels, which offer a variety of power or convenience features. Experience peak luxury with the Denali Ultimate trim or choose the unmatched confidence of the AT4X—whatever you’re looking for, the 2025 GMC Sierra Heavy Duty has a trim that’s right for you.
The Pro trim level is the entry-level model and comes standard with the 6.6L V8 gas engine with Allison 10-speed automatic transmission. A Trailering Package, Trailering Mirrors, and Trailer Brake Controller are also included standards on the 2025 GMC Sierra Heavy Duty Pro. Enjoy best-in-class HD cargo box volume and standard wireless Apple CarPlay® and Android Auto™ connectivity alongside an 8” infotainment touchscreen. The Pro features the Sierra HD Pro Safety package, which includes safety features like forward collision alert, automatic emergency braking, and more. You can upgrade your 2025 GMC Sierra Heavy Duty Pro to run on a Duramax 6.6L Turbo-Diesel V8 as well as add in Adaptive Cruise Control!
The SLE trim level is a step up from the Pro trim, featuring all Pro standard features in addition to a 13.4” infotainment screen alongside a 12.3” digital instrument cluster for a sleek, tech-heavy look in the cabin. In addition, the SLE features a Traction Select System with Tow/Haul mode and 17” machined aluminum wheels. Upgrade your SLE with the Duramax 6.6L Turbo-Diesel engine, Adaptive Cruise Control, an enhanced camera view which includes up to 13 camera views (including transparent trailer view!), or MultiPro Tailgate and MultiPro Tailgate Audio System by Kicker. You can also transform your 2025 GMC Sierra Heavy Duty SLE into an off-road all-star with the X31 off-road package, featuring twin-tube shocks and skid plates.
The SLT trim level features all the standard features of the SLE trim, in addition to injecting more convenience and comfort into the cabin. With a 10-way power driver and front outboard passenger heated seats with lumbar and heated steering wheel, each and every drive you make will happen in comfort. The SLT also comes with standard ProGrade Trailering System with In-Vehicle Trailering App, MultiPro Tailgate, and 18” machined aluminum wheels with dark gray metallic accents. You can swap to the Duramax 6.6L Turbo-Diesel engine as well as add additional Adaptive Cruise Control for enhanced driver assistance tech. You can inject even more luxury into your 2025 GMC Sierra Heavy Duty SLT with a 10-way power-adjustable front heated and ventilated bucket seats with perforated leather appointments.
The AT4 trim level transforms your 2025 GMC Sierra Heavy Duty workhorse into a rugged off-roader! The AT4 trim comes with all the standard features of the SLT trim and features a unique Jet Black interior with Kalahari accents and heated and ventilated perforated front leather seating surfaces. 20” gloss-black aluminum wheels with off-road tires, off-road Suspension Package with twin-tube shocks and ski plates, Adaptive Cruise Control, and up to 14 available camera views with HD Surround Vision come standard as well for an enhanced off-roading experience. Looking for more power? Swap to the Duramax 6.6L Turbo-Diesel engine. Then, add a 15” Head-Up display with an off-road inclinometer to take total control of your drive.
The AT4X trim level offers the ultimate in off-road capability, with all the standard features of the AT4 alongside premium off-roading upgrades like a factory-installed 1.5” suspension lift, Multimatic DSSV dampers, rear electronic-locking differential, and larger steel transfer case skid plate and front aluminum skid plate. The AT4X also features 35” Territory MT tires and 16-way heated and ventilated power front seats with massage features. The 2025 GMC Sierra Heavy Duty AT4X’s interior also gets a premium touch, with an Obsidian Rush interior featuring full-grain leather seating with technical-grain leather accents and authentic Vanta ash wood. Available upgrades include the Duramax 6.6L Turbo-Diesel engine and the unique AT4X AEV Edition. This exclusive edition includes stamped steel bumpers, steering gear, and transfer case ski plates in addition to 18” Salta gloss-black wheels.
The Denali trim level emphasizes comfort and luxury in your 2025 GMC Sierra Heavy Duty! Featuring all the standard features of the SLT, it also comes with 20” Ultra-Bright machined wheels with bright chrome inserts and 12-way heated and ventilated power front seats. The interior of the Denali is styled to impress, with authentic open-pore wood, patterned aluminum trim, and forge perforated leather seating surfaces. The chrome accents of the 2025 GMC Sierra Heavy Duty Denali are sure to turn heads! Available upgrades include the Duramax 6.6L Turbo-Diesel engine, power sunroof, and a rear camera mirror. Just because you work hard doesn’t mean you can’t do so in style! Choose the Denali trim when you’re looking for a luxurious work experience.
The Denali Ultimate trim level provides the ultimate luxury experience! The 2025 GMC Sierra Heavy Duty Denali Ultimate features all the standard features of the Denali but runs standard on the Duramax 6.6L Turbo-Diesel engine. The Denali Ultimate makes a statement every time it hits the road with a unique Signature Vader Chrome grille and exclusive 20” Ultra-Bright machined aluminum wheels with gloss-black inserts. The interior is equally eye-catching, with Alpine Umber surfaces featuring full-grain leather seating, authentic open-pore Paldao wood and 16-way power front seats with massage features. A 12-speaker Bose Premium Series with Centerpoint surround sound system and illuminated power assist steps and MultiPro Tailgate Audio System by KICKER caps off the Denali Ultimate’s standard feature inclusions. Want to keep an eye on your trailer? Add the auxiliary trailer camera and haul in style.
Sierra HD Pro Safety features
Each 2025 GMC Sierra Heavy Duty includes Sierra HD Pro Safety standard, which is packed full of must-haves for safety-conscious drivers. The standard package of Sierra HD Pro Safety includes automatic emergency braking, automatic high-beams, front pedestrian braking, buckle to drive, lane-departure warning, following distance indicator, and forward collision alert. Blind-spot monitoring and rear cross-traffic alert are available as upgrades for drivers looking for additional security.
Choose your 2025 GMC Sierra Heavy Duty at Circle Buick GMC Hummer EV
Find your favorite 2025 GMC Sierra Heavy Duty trim at Circle Buick GMC Hummer EV in Highland, IN! Our team will be happy to help get you behind the wheel of the 2025 GMC Sierra Heavy Duty that’s the perfect complement to your daily routine. The 2025 GMC Sierra Heavy Duty’s unparalleled power and luxury styling is sure to keep you and your passengers happy no matter how long the haul! Tackle your toughest challenges with the 2025 GMC Sierra Heavy Duty from Circle Buick GMC Hummer EV today.
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