2021 GMC Sierra 3500 Accessories & Parts

The GMC Sierra 3500 is a solid choice for those who need big capability for lugging hefty loads and are loyal to the GM brand name. From its mechanically-related Chevy Silverado sibling, the Sierra HD differs with its premium flair that comes in the form of the luxurious Denali trim level and the availability of a multi-function tailgate that can be anything from a work table to a bench to a load stop. When equipped with an optional Duramax diesel engine and RWD, dually wheels, and the right towing accessories, the 2021 Sierra 3500 can pull up to 35,500 pounds. Its payload capacity maxes out at 7,442 pounds. If you are looking for the right equipment to outfit your heavy-duty pickup truck for work or recreation, maintain it in pristine condition, or customize its appearance or performance, search no further. We have a variety of 2021 GMC Sierra 3500 accessories and parts you may need for these and other purposes.

People who tow a lot became the driving force behind the changes that General Motors launched for 2021 GMC Sierra pickup trucks. The 3500HD’s trailering tech gained lots of new and improved features called to make this task safer and less daunting. Drivers can now back up and hook up a trailer more easily thanks to more advanced camera-based systems. Among the new handy technologies, there is a Trailer Length Indicator feature that monitors cross traffic and objects in blind spots enabling safer lane changes, and Jack-Knife Alert that sends sound/vibration warnings when a jack-knife situation is likely to occur.

Introduced just last year, the fourth-gen Sierra 3500HD is mechanically unchanged for 2021. It comes in the base, mid-range SLE & SLT, off-road AT4, and luxury-grade Denali trim levels, some of which got tech and functional updates this year. To wit, the AT4 now has 18-inch mud tires and high-clearance assist steps on the list of optional accessories and parts, while the Denali model gets standard 360-degree and bed view cameras. The new Black Diamond Edition is also available for the top-of-the-line trim level, which adds exclusive 20-inch black rims and a host of equipment including retractable steps, a Kicker sound system, an auxiliary trailer camera, and other premium features.

Engine choices carry over, meaning buyers can select from either a 6.6-liter 401-hp gasoline V8 teamed with a six-speed automatic or the Duramax diesel with the same displacement and cylinder configuration, mated to a 10-speed automatic by Allison. The Duramax unit makes 445 hp and 910 lb-ft of torque. The Sierra HD lineup features variable-ratio steering and an independent suspension up front, which to some degree address maneuverability and ride quality issues peculiar to big rigs. In the world of HD pickups, keeping your vehicle in excellent condition is of utmost importance as it’s often the mechanical state of your truck that your work depends on. We offer high-quality 2021 GMC Sierra 3500 parts, fluids, and tools that will keep your vehicle on the road for years to come, at affordable prices.

Want to make your 2021 GMC Sierra 3500 one of a kind, keep it running at its peak, or turn it into a high-powered beast? Our vast selection of premium accessories and parts ticks all the boxes. Quality is at the heart of everything we do at CARiD, so whatever your project, our brand name products and qualified experts will ensure success. Class. Luxury. Durability. We have it all, and we're always here with everything you need to keep your 2021 GMC Sierra 3500 in tip top shape, inside and out.