2011 GMC Sierra 2500HD III (GMT900, facelift 2011) Regular Cab Long Box Dimensions, Size & Specs

The 2011 GMC Sierra 2500HD III Regular Cab Long Box has dimensions of 5715 mm (224.9 inches) in length, 2032 mm (79.9 inches) in width with mirrors open, and a height of 1971 mm (77.6 inches). Standard residential garages typically measure around 2440 mm to 2740 mm (96 to 108 inches) in width and 4877 mm (192 inches) in length. Given its length exceeds 5.7 meters (nearly 19 feet), parking this truck inside a standard-sized garage may be tight or not feasible unless the garage is specifically designed for larger vehicles. Its width also approaches the limit with mirrors open, so careful consideration is necessary for garage fitment.

The provided width dimension of 2032 mm (79.9 inches) for the 2011 GMC Sierra 2500HD III refers to the truck's width with the mirrors opened, which increases the overall vehicle width. When mirrors are folded, the width reduces, though exact folded mirror dimensions are not specified here. Typically, folding mirrors can reduce vehicle width by approximately 150-200 mm (6-8 inches). This folded width is beneficial for maneuvering in tight spaces like parking lots or narrow streets, but the official width with mirrors open is most relevant for driving safety and clearance.

The 2011 GMC Sierra 2500HD III Regular Cab Long Box offers a ground clearance of 231 mm (9.1 inches). This ride height allows the pickup to navigate over obstacles such as rocks and uneven terrain with less risk of undercarriage damage. A ground clearance over 200 mm is typically considered good for off-road driving, ensuring the vehicle can handle rural, construction, and off-road environments effectively. This clearance also assists in fording shallow water crossings.

The curb weight of the 2011-2014 GMC Sierra 2500HD III Regular Cab Long Box varies between 2634 kg (5809 lbs) and 3094 kg (6820 lbs), depending on trim and configuration. Its maximum weight, or Gross Vehicle Weight Rating (GVWR), ranges from 4309 kg (9497 lbs) to 4536 kg (10,000 lbs). This weight capacity allows it to haul and tow heavy loads efficiently, typical for heavy-duty pickup trucks. The discrepancy between curb and maximum weight underlines its payload and towing capabilities.

With rear seats folded, the GMC Sierra 2500HD III Regular Cab Long Box provides a luggage or cargo capacity of approximately 2138 liters (75.5 cubic feet). Although this model features a regular cab, its long box contributes to a generous cargo space ideal for transporting tools, equipment, and large items securely. The large cargo bed volume is a key highlight for users requiring substantial payload areas.

The 2011-2014 GMC Sierra 2500HD III Regular Cab Long Box supports multiple rim sizes including 7.5J x 17 inches, 8J x 18 inches, 8.5J x 18.5 inches, and 8.5J x 20 inches. Corresponding tire sizes vary as 245/75 R17, 265/70 R17, 265/70 R18, and 265/60 R20. This flexibility allows owners to customize their truck for comfort, handling, and off-road capability according to their needs.

The 2011-2014 GMC Sierra 2500HD III (GMT900 facelift) underwent several dimension and feature updates from the previous GMT800 generation. Generally, the Sierra III gained slightly greater length and width, contributing to a more spacious cargo bed and improved interior room. The updated model also enhanced ground clearance and payload capacities. This growth in dimensions was designed to keep pace with competitor advancements and offer better utility and comfort while maintaining the ruggedness expected of heavy-duty pickups.

Compared to other heavy-duty pickups like the Ford F-350 Super Duty and Ram 2500, the GMC Sierra 2500HD III Regular Cab Long Box is competitively sized with its length at 5715 mm (224.9 inches) and width at 2032 mm (79.9 inches) with mirrors open. While Ford and Ram models might offer similar or slightly varying dimensions depending on cab and bed configurations, the Sierra tends to provide robust cargo bed volume and ground clearance, making it a strong contender in its class. Buyers often choose based on specific payload, towing capacities, and brand preference.

The 2011 facelift of the GMC Sierra 2500HD III marked the latter stage of the GMT900 platform with several design and technical enhancements. It introduced refreshed front-end styling, updated grille designs, improved suspension for better ride comfort, and enhanced towing technology. These updates aimed to keep the model competitive against newer trucks entering the market, combining modern aesthetics with the proven durability and size-oriented utility of the GMT900 platform.