2011 GMC Sierra 3500HD III (GMT900, facelift 2011) Crew Cab Long Box Dimensions, Size & Specs

The curb weight of the 2011 GMC Sierra 3500HD III ranges between 2899 kg to 3627 kg (approximately 6395 to 7997 pounds), reflecting differences depending on configuration and optional equipment. Its maximum gross vehicle weight rating (GVWR) spans from 4853 kg to 5908 kg (10,700 to 13,020 pounds), illustrating its heavy-duty capability. This wide capacity range allows the truck to handle substantial towing and payload demands, making it suitable for commercial use, hauling large equipment, or heavy cargo. The high GVWR ensures the truck can safely support both the vehicle and payload weights under strenuous conditions without compromising safety or performance.

The 2011 GMC Sierra 3500HD III Crew Cab Long Box offers a ride height (ground clearance) between 213 mm to 216 mm (8.4 to 8.5 inches). This ground clearance is advantageous for off-road driving, allowing the truck to pass over uneven terrain and obstacles with relatively less risk of undercarriage damage. It also improves approach and departure angles, which is crucial for driving on construction sites or trails. For everyday urban and highway use, this clearance balances comfort and capability, although it might result in a taller step-up height for passengers entering or exiting the vehicle.

With the rear seats folded down, the 2011 GMC Sierra 3500HD III Crew Cab Long Box provides a spacious rear interior luggage capacity of 2138 liters (equivalent to around 75.5 cubic feet). This generous cargo space inside the cabin is ideal for transporting bulky items that need protection from the elements or secure storage. This capacity is especially beneficial for commercial users or outdoor enthusiasts who require a secure area beyond the traditional truck bed for tools or gear.

The 2011 GMC Sierra 3500HD III Crew Cab Long Box’s dimensions, particularly its length of 6581 mm (21.58 feet) and width of 2436 mm (7.99 feet) with mirrors extended, typically exceed the size of a standard residential garage. Most standard garages measure around 6 meters (20 feet) in length and around 2.4 to 2.7 meters (8 to 9 feet) in width. Given this, parking the Sierra 3500HD inside a normal home garage can be challenging unless the garage is specially enlarged or designed for large trucks. Owners often require a larger or dedicated commercial-sized garage or driveway space to accommodate this vehicle comfortably.

Compared to its predecessor (the GMC Sierra 3500HD II), the 2011 Sierra 3500HD III offers increased length and a more robust stance. The third generation (GMT900 facelift) extended slightly in length to approximately 6581 mm (21.58 feet), providing greater bed and cabin space for cargo and passengers. Improvements also included refined weight management with curb weights between 2899 kg and 3627 kg, enhancing towing capacity and payload without excessive bulk. The ground clearance rose marginally to about 213-216 mm (8.4-8.5 inches), improving off-road and rugged terrain capability. The facelift also incorporated updates to exterior styling, safety, and mechanical components, making the III generation a notable upgrade for utility and driver comfort over the II generation.

In comparison to similar heavy-duty pickups such as the Ford F-350 Super Duty and the Ram 3500 from the same era, the 2011 GMC Sierra 3500HD III holds its own as a large, capable truck. Its length of 6581 mm (21.58 feet) and width of 2436 mm (7.99 feet including mirrors) are quite comparable to these competitors, which generally range between 6.4 to 6.7 meters in length and similar widths. The Sierra’s weight class and towing ratings, coupled with its ground clearance of about 213-216 mm (8.4-8.5 inches), align well within the heavy-duty segment offering competitive payload and off-road performance. Buyers looking for maximal utility, a spacious crew cab, and a durable long box will find the Sierra a formidable choice alongside its peers.

The 2011 GMC Sierra 3500HD III Crew Cab Long Box commonly comes equipped with either 235/80 R17 or 265/70 R18 tires. The 235/80 R17 sizes provide a balance of comfort and durability for general highway and light off-road use, with a tire profile that absorbs rough road impacts effectively. The 265/70 R18 tires, offering a wider footprint and slightly larger diameter, enhance traction and stability, especially on uneven or muddy terrain. These sizes also contribute to the truck’s ground clearance while maintaining adequate sidewall strength for handling heavy loads. The choice between these tires can influence ride smoothness, fuel economy, and off-road capability depending on terrain and driving conditions.

The 2011 GMC Sierra 3500HD III measures 2436 mm (95.9 inches or roughly 7 feet 11.9 inches) wide with mirrors opened, classifying it as a wide vehicle typical for heavy-duty pickups. This width provides ample cabin space and bed area but demands careful attention when driving through narrow city streets, parking lots, or tight spaces. Drivers must be mindful of clearance, particularly with the side mirrors extended, which add to the overall width and can be susceptible to contact in cramped areas. Maneuvering skills and planning for wider parking spots are advisable. The vehicle’s substantial width ultimately contributes to stability and cargo capacity, essential for its utility purpose.

Standing at 1979 mm (78 inches or about 6.5 feet) tall, the 2011 GMC Sierra 3500HD III Crew Cab Long Box is relatively tall for a pickup truck, contributing to its commanding road presence and generous interior headroom. While this height benefits occupant comfort and visibility, it may pose clearance challenges in some residential garages and parking structures where ceiling heights can be limited, especially considering roof-mounted accessories or loaded roof racks. It also means passengers must step up higher to enter or exit the vehicle, which might be a consideration for accessibility. Overall, the height aids in heavy-duty usage and off-road clearance but requires awareness for vertical space limitations.