2007 GMC Sierra 2500HD III (GMT900) Regular Cab Long Box Dimensions, Size & Specs

The 2007 GMC Sierra 2500HD III Regular Cab Long Box stands at a height of 1939 mm (76.4 inches), with a ride height (ground clearance) of 243 mm (9.6 inches). This relatively tall stature and generous ground clearance enhance its off-road capabilities by allowing it to clear obstacles more easily and handle rough terrain. Additionally, the elevated loading bed height facilitates easier loading and unloading of heavy equipment, while providing better visibility and road presence for the driver.

The curb weight of the 2007 GMC Sierra 2500HD III Regular Cab Long Box ranges from 2379 kg to 2853 kg (5248 to 6290 lbs). The heavier weight is typical for a heavy-duty pickup truck configured to carry and tow significant loads, which contributes positively to stability and durability under tough conditions. However, this weight also impacts fuel economy, generally making it lower compared to lighter vehicles. Drivers should expect robust performance capabilities balanced against higher fuel consumption typical of HD trucks.

The maximum weight capacity, or Gross Vehicle Weight Rating (GVWR), of the 2007 GMC Sierra 2500HD III Regular Cab Long Box is 4173 kg (9200 lbs). This high GVWR rating allows the vehicle to carry heavy payloads and tow large trailers, making it ideal for commercial use, construction, towing, and other demanding tasks. It reflects the truck's capability to safely handle a combination of the vehicle’s curb weight plus passenger, cargo, and trailer weights without risking mechanical or safety failures.

The 2007 GMC Sierra 2500HD III Regular Cab Long Box offers a luggage capacity of 2138 liters (approximately 75.5 cubic feet) with rear seats folded down. This substantial cargo volume is largely attributed to its long box design, providing ample space for transporting tools, equipment, and large items. Since this configuration is a regular cab, rear seat space is limited, but folding the available space maximizes storage ability, serving the needs of users who require significant hauling capacity.

Fitting the 2007 GMC Sierra 2500HD III Regular Cab Long Box into a standard garage can be challenging due to its length of 5708 mm (224.7 inches), width of 2032 mm (79.9 inches) including mirrors, and height of 1939 mm (76.4 inches). Most typical residential garage doors and spaces are around 2.4 to 2.7 meters wide and 5.5 to 6 meters deep, so the truck’s length is close to or slightly exceeds common garage depths. It might fit, but maneuvering will require caution, and garage regions with larger dimensions or specialized truck garages are preferable.

Compared to its predecessor (the GMT800 generation Sierra 2500HD), the 2007 GMC Sierra 2500HD III (GMT900) Regular Cab Long Box is generally larger, featuring increased length, width, and height, which translates into greater interior space and cargo capacity. The newer generation improved its ride height and ground clearance as well, helping with off-road capability and overall robustness. This dimensional growth reflects GMC’s efforts to enhance durability, performance, and utility to meet the higher demands of heavy-duty truck users.

When compared to similar heavy-duty pickup trucks such as the Ford F-250 Super Duty or RAM 2500 from the same era, the GMC Sierra 2500HD III Regular Cab Long Box holds its own with competitive dimensions—its length (5708 mm) and width (2032 mm) are in line with industry standards for long bed trucks. Its 243 mm ground clearance and strong GVWR of 4173 kg make it equal or slightly superior in towing and payload capacity. GMC focuses on a balance between comfort, ride quality, and utility, making it a favored choice among buyers seeking a capable and reliable HD pickup.

The 2007 GMC Sierra 2500HD III Regular Cab Long Box comes equipped with rim sizes of 6.5J x 16, 7.5J x 17 and tire sizes including 245/75 R16 and 265/75 R17. These configurations contribute to a balanced ride, durability, and off-road capability, offering enough traction and stability for heavy loads and variable road conditions. The tire choice aligns well with the truck’s load rating and robustness, enhancing towing performance, braking safety, and comfort considering the truck's intended heavy-duty use.

The long box bed design of the 2007 GMC Sierra 2500HD III Regular Cab provides a longer cargo bed compared to standard or short box versions, typically exceeding 2.4 meters (approximately 8 feet) in length. This allows for hauling longer items such as lumber, pipes, or equipment that shorter beds cannot accommodate easily. For tradespeople, contractors, and towing enthusiasts, the long box maximizes utility and flexibility. In addition, this truck’s high payload capacity complements the bed size, permitting heavier loads to be carried safely.