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

The 2011 GMC Sierra 3500HD III Regular Cab Long Box has a curb weight ranging from 2619 kg to 3304 kg (5778 to 7284 lbs), which depends on the specific configuration and equipment installed. Its maximum gross vehicle weight (GVWR) ranges from 4717 kg to 6078 kg (10400 to 13400 lbs). This wide range in maximum weight shows its versatility in handling various heavy-duty tasks. The robust build and higher weight capacity translate to excellent towing and payload capabilities, making it ideal for industrial, agricultural, and construction uses. The higher curb weight also contributes to its stability and durability on tough terrains and under heavy loads.

The ground clearance or ride height of the 2011 GMC Sierra 3500HD III Regular Cab Long Box ranges from 218 mm to 224 mm (8.6 to 8.8 inches). This substantial ground clearance allows the truck to navigate rough terrains, uneven surfaces, and off-road conditions more effectively than vehicles with lower clearance. It helps prevent damage to the undercarriage when driving over obstacles such as rocks or debris. The truck’s height also improves approach, departure, and break-over angles, making it suitable for work environments where off-road capability is essential.

Fitting the 2011 GMC Sierra 3500HD III Regular Cab Long Box into a standard home garage can be challenging due to its considerable size. With a length of 5715 mm (224.9 inches or approximately 18.75 feet) and a width with mirrors extended up to 2436 mm (95.9 inches or roughly 8 feet), this truck exceeds the dimensions of many typical residential garages, which often have depth around 6000 mm (20 feet) and width around 2400 mm (8 feet). Additionally, the height nearing 1970 mm (77.6 inches or about 6.5 feet) should generally fit garage height-wise. However, owners with standard two-car garages may find the truck snug or require a wider garage or workshop space to accommodate it comfortably without risking damage.

The 2011 GMC Sierra 3500HD III Regular Cab Long Box offers a sizeable cargo volume of approximately 2138 liters (75.5 cubic feet) with the rear seats folded down. This makes it highly practical for transporting large or bulky items, especially useful for commercial and industrial purposes where maximum cargo space is essential. Keep in mind that the Regular Cab Long Box configuration focuses more on bed space; the extended box length provides ample room for hauling larger tools, materials, or recreational equipment, making it a versatile option for users requiring both passenger and payload functionality.

The 2011 GMC Sierra 3500HD III Regular Cab Long Box, which is part of the GMT900 platform with a 2011 facelift, is generally a refined and slightly larger evolution of its predecessor (the Sierra 3500HD II, GMT800). While precise dimensional increases vary, the GMT900 series typically boasts improved overall length, width, and height for better interior space, capability, and road presence. For instance, the length of around 5715 mm (224.9 inches) is slightly longer than prior generation models which offered comparable but slightly less cargo and passenger room. The width with mirrors extended up to 2436 mm (95.9 inches) reflects improvements in driver visibility and safety features. The facelift also brought enhancements in curb weight and maximum load ratings, making the 2011 model more durable and capable for heavy-duty tasks.

In comparison to other heavy-duty pickups from the 2011 period such as the Ford F-350 Super Duty and the Ram 3500, the GMC Sierra 3500HD III Regular Cab Long Box holds a competitive stance in terms of size and capability. The Sierra’s length of 5715 mm (224.9 inches) is very much in line with these rivals, although some models may offer slight variations in bed length or cab configurations. Its width range of 2032 to 2436 mm (79.9 to 95.9 inches) with mirrors extended is consistent with the industry standard for wider mirrors required on trucks in this class for towing and visibility purposes. Ground clearance, weight capacity, and cargo volume are similarly competitive, positioning the Sierra as a solid choice among heavy-duty pickups, especially for buyers looking for a strong balance of space, power, and reliability.

The 2011 GMC Sierra 3500HD III Regular Cab Long Box typically comes equipped with tire sizes such as 235/80 R17 or 265/70 R18. These sizes refer to the tire width, aspect ratio, and rim diameter, respectively. Larger tires like the 265/70 R18 provide better ground contact and enhanced handling, especially off-road or under heavy load, while slightly smaller tires like the 235/80 R17 can offer a balance of ride comfort and fuel efficiency. The tire size is a crucial factor contributing to the truck's ability to manage its substantial curb weight and maximum load, affecting traction, braking, and ride quality. Choosing the correct tire size ensures optimal performance and safety for its heavy-duty applications.

The 2011 facelift of the GMC Sierra 3500HD III brought several notable upgrades and refinements over the initial GMT900 models. It included exterior styling enhancements such as a redesigned grille, headlights, and updated bumpers that gave the truck a refreshed and more modern look. The facelift also introduced improvements in aerodynamics, which helped with fuel economy and noise reduction at highway speeds. Inside, there were updates to the infotainment system, interior materials, and comfort features, elevating the overall driver and passenger experience. Additionally, there were enhancements to towing capacity, suspension tuning, and powertrain components that further increased the truck’s capability and reliability for demanding professional workloads.

The Regular Cab Long Box configuration of the 2011 GMC Sierra 3500HD III is designed primarily for users who need maximum cargo bed length and load capacity rather than extensive passenger seating. This setup provides a long 8-foot bed, ideal for transporting large equipment, building materials, or recreational gear, making it a top choice for contractors, farmers, and commercial operators. While it seats fewer passengers, it offers a simpler and lighter cab design which can contribute to better payload and towing capacity. Compared to Crew or Double Cab variants, the Regular Cab lacks rear passenger space, but it maximizes bed utility, making it an optimal choice for those prioritizing work functionality over passenger accommodation.