2021 GMC Sierra | Towing Capacity, Price, Interior, Engine & More

2021 GMC Sierra 1500 SLE Double Cab Standard Box 2WD in Summit White

2021 GMC Sierra | Light Duty Pickup Truck


The GMC Sierra 1500 is a great choice for Youngstown, Ohio drivers in the market for a full-sized truck. With a powerful engine lineup, excellent towing capacity, and a variety of cabin and cargo bed options to meet your needs, there’s no shortage of features to get excited about. Let’s run through some of the key facts you should know.

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2021 GMC Sierra in Quicksilver Metallic 3/4 view from passenger side
2021 GMC Sierra in Cardinal Red 3/4 view from passenger side
2021 GMC Sierra in Pacific Blue Metallic 3/4 view from passenger side

Cargo Beds

The Sierra 1500 can be fitted with three cargo beds which measure 8 feet, 6 feet 6 inches, and 5 feet 8 inches. The longest bed can only be had with the regular cab, which has one row of seats. The shortest bed is only available with the largest cab, known as the Crew Cab.

2021 GMC Sierra Engine

The Sierra’s standard engine is a V-6 with 285 horsepower, which will satisfy most of your daily driving requirements. If you plan on doing a lot of towing and heavy lifting, you may want to upgrade to either of the two V-8 options: a 5.3-liter V-8 capable of generating 355 horsepower, or a 6.2-liter V-8 with 420 horsepower. Finally, there’s the option of a turbocharged V-4, which has 310 horsepower, and a turbocharged diesel engine, which has 277 horsepower. Both of these latter options are good if you’re concerned about gas mileage.

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Entertainment and Technology


Inside your cab, the Sierra infotainment system boasts a seven-inch touch screen, six-speaker stereo, and Bluetooth connectivity. You can easily pair your phone with the entertainment system, thanks to Apple CarPlay and Android Auto. You can upgrade to a larger eight-inch screen, a premium seven-speaker stereo, a wireless hotspot, and a navigation system.

Some trims offer keyless entry to make things easier when you’re getting into your truck, and a dual-zone automatic climate control to keep the cab at a comfortable temperature once you’re inside.

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2021 GMC Sierra Interior

The Sierra’s regular cab has a 40-20-40 folding bench seat that can hold three people. This cab is ideal for work trucks and is only available in the Sierra’s base trim. The Double Cab adds a rear row of seating that can accommodate adults for short trips or kids. The Crew Cab provides additional space in the rear row for added comfort. Cabs with rear-row seating feature two sets of LATCH connectors on the outer rear seats for installing child seating.

2021 GMC Sierra 2500/3500HD Crew Cab AT4 Interior Featuring Rear Seat Storage; Jet Black with Kalahari Accents Interior Seating 2021 GMC Sierra Denali 1500 Interior in Jet Black; Center Stack with GMC Infotainment System and HVAC Controls 2021 GMC Sierra 1500 AT4 Crew Cab with (CWM) Technology Package; Full Interior with Jet Black Perforated Leather-Appointed Seating with Kalahari Accents 2021 GMC Sierra 1500 SLT Interior in Jet Black; Detail Shot of Rear Center Console HVAC, Heated Seat Controls and USB Outlets.
2021 GMC Sierra in Quicksilver Metallic 3/4 view from rear passenger side
2021 GMC Sierra in Cardinal Red 3/4 view from rear passenger side
2021 GMC Sierra in Pacific Blue Metallic 3/4 view from rear passenger side

2021 GMC Sierra Towing Capacity

With the right setup, a GMC Sierra can tow up to 11,800 pounds and haul 2,250 pounds of cargo. To achieve this, you’ll need to have a setup that includes the 6.2-liter V-8 engine, the Double Cab, four-wheel drive, and the mid-length cargo bed. Additionally, you’ll need to add the max Trailering package. If heavy cargo is your priority, the Sierra’s maximum payload is only available if you choose the regular cab.

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GMC Sierra 4×4 – Off-Roading


All Sierra trims are available with four-wheel drive, so they can handle rough terrain without too many problems. However, if you’re planning to do serious off-roading regularly, your best option is the AT4 trim. This model features four-wheel drive as standard, and also comes equipped with front and rear skid plates, hill descent control, and a traction select system. You’ll also get a two-inch suspension lift for improved performance. Finally, it has shock absorbers and tow hooks. You can have the AT4 with either of the two V-8 engines, or the turbocharged diesel.

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2021 GMC Sierra 1500 AT4 Crew Cab Short Box 4WD in Red Quartz Tintcoat with (RT5) 18" Machined Aluminum Wheels and Available (LM2) Duramax 3.0L Turbo-Diesel I6 Engine; with High Clear Step; 7/8 Drivers side Front; Driving through mud with mountains in background
2021 GMC Sierra 1500 Elevation Crew Cab Short Box in Cardinal Red with (RD3) 20" Black Gloss Painted Aluminum Wheels; 3/4 Passengers side Front; Lifestyle with Talent; Mountain bike/bicycle props; Waterfront location with mountains in background 2021 GMC Sierra 1500 AT4 Carbon Pro Edition in Summit White; Showing Red Recovery / Tow Hooks 2021 GMC Sierra 1500 SLT (L84) 5.3L EcoTec3 V8 Engine 2021 GMC Sierra 1500 SLT DIC / Driver Information Center Showing Rear Seat Reminder; Safety Feature; Interior

Appearance and Work Packages

To tailor the Sierra to your individual needs, we offer a range of appearance and work packages that provide additional styling and capabilities. For example, the Elevation Black package adds black GMC emblems and assist steps to your truck.

The Trailering package is ideal if you do a lot of towing. It adds a two-inch hitch and hitch guidance. The Max Trailering package and ProGrade Trailering system include additional towing features, such as a stronger rear axle and improved rear suspension. The Snow Plow Prep package includes everything you’ll need to help your truck clear the roads during the winter months, including heavy-duty front springs, a high-capacity air filter, and skid plates.

Safety and Driver Assistance


The Sierra achieved a good score of four out of five stars in the crash tests performed by the National Highway Traffic Safety Administration. There are several optional features to help you drive safely on the highway, including adaptive cruise control, lane keep assist, and lane departure warning. To help with parking, you can choose from rear and front parking sensors, or a surround-view parking camera that allows you to see from all angles how you’re maneuvering your truck into position .

A useful standard feature with the Sierra is its Teen Driver mode. This allows you to put certain restrictions on the truck’s capabilities, such as an upper speed limit, if a young family member is learning to drive.

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2021 GMC Sierra Trim Levels

The 2021 Sierra 1500 is available in six trims. These are base, SLE, Elevation, SLT, At4, and Denali. Your choice of GMC Sierra trim will depend a lot on your preferred configuration of cab and cargo bed, since not all trims feature all possible combinations. For example, your only trim option if you want the longest cargo bed with the regular cab is the base trim. The SLE trim adds keyless entry and a larger infotainment screen, among other features.

The Elevation trim offers in-bed lighting, which is sure to prove useful if you work a lot at night or want to move around easier in your cargo box. The SLT trim is a good option if you want a little more luxury in the cab, since it features leather upholstery, heated and power-adjustable front seats, and a heated steering wheel.

In the top-of-the-range Denali, you gain access to all of the Sierra’s driver assistance features, a premium stereo, and wireless device charging.

We hope this overview of the Sierra 1500’s specs and features has helped you decide whether it’s the right full-sized truck for you. Do you have questions about any aspect of the Sierra? Whatever your query relates to, don’t hesitate to contact us today at Sweeney Cars. Our team of auto experts know what truck buyers like you are looking for and can help you tailor the GMC Sierra 1500 to suit your requirements.

Summit White

GMC Sierra 2021 in Summit White

Brownstone Metallic

GMC Sierra 2021 in Brownstone Metallic

Cardinal Red

GMC Sierra 2021 in Cardinal Red

Cayenne Red Tintcoat

GMC Sierra 2021 in Cayenne Red Tintcoat

Dark Sky Metallic

GMC Sierra 2021 in Dark Sky Metallic

Onyx Black

GMC Sierra 2021 in Onyx Black

Pacific Blue Metallic

GMC Sierra 2021 in Pacific Blue Metallic

Quicksilver Metallic

GMC Sierra 2021 in Quicksilver Metallic

Satin Steel Metallic

GMC Sierra 2021 in Satin Steel Metallic