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

The 2007-2010 GMC Sierra 2500HD III Extended Cab Standard Box exhibits a curb weight ranging from 2529 to 2978 kg (5576 to 6566 lbs), which reflects the truck’s robust construction and heavy-duty capabilities. Its maximum weight is rated at 4173 kg (9200 lbs), defining the Gross Vehicle Weight Rating (GVWR) that includes the vehicle, passengers, cargo, and trailer tongue weight. This substantial margin enables the Sierra 2500HD to manage large payloads and heavy towing demands effectively. The elevated curb weight contributes to vehicle stability and durability but also requires powerful engine options to maintain performance. Overall, these weight specifications underscore the vehicle's suitability for demanding tasks such as commercial hauling, heavy equipment transport, and off-road usage.

The GMC Sierra 2500HD III Extended Cab Standard Box (2007-2010) offers a ground clearance of 243 mm (9.6 inches), which is a key factor in its off-road capability and everyday usability. This clearance allows the truck to traverse rough terrains, including rocky paths and uneven surfaces, with less risk of undercarriage damage. For off-road enthusiasts and work environments requiring rugged terrain navigation, this height provides confidence and utility. In urban or suburban settings, the ground clearance facilitates better visibility and ease of handling speed bumps and uneven roads, although drivers must adjust parking and garage usage according to the vehicle's height.

The GMC Sierra 2500HD III Extended Cab Standard Box (2007-2010) provides an impressive rear luggage capacity of approximately 1718 liters (60.6 cubic feet) with the rear seats folded. This significant volume allows for transporting large, bulky items securely within the extended cab space, enhancing the truck's versatility beyond the bed area alone. The combination of the extended cab design and foldable seating expands cargo options, making the vehicle practical for both professional tasks and recreational activities that require considerable storage.

The GMC Sierra 2500HD III Extended Cab Standard Box spans 2032 mm (80 inches) wide with mirrors opened, which is wider than many standard vehicles and must be taken into account when parking or navigating tight spaces. This width can make maneuvering in narrow city streets, parking garages, and residential driveways challenging. For garage use, the total width requires confirmation that the garage opening and space inside are adequate to accommodate the vehicle's full width without damaging mirrors or bodywork. Drivers should measure their specific parking environments and consider mirror folding features to mitigate tight situations.

Typically, a standard residential garage measures about 2.44 meters (8 feet) in width and roughly 5.5 to 6 meters (18 to 20 feet) in length. The GMC Sierra 2500HD III Extended Cab Standard Box, with a length of 5850 mm (230.3 inches or 19.4 feet) and a width of 2032 mm (80 inches or 6.7 feet) including mirrors, is generally too long and wide to comfortably fit into a standard garage without difficulty. The width with mirrors opened is especially challenging, as typical garage widths rarely exceed 2.44 meters. Without folding the mirrors and assuming the garage is on the larger end of the size spectrum, it might be possible but somewhat tight. Additionally, the vehicle's height of 1951 mm (6.4 feet) should be confirmed against ceiling height. Owners with this truck often require larger garages or dedicated parking spaces, such as oversized or commercial garages.

Compared to its predecessor generation, the GMC Sierra 2500HD III (GMT900) Extended Cab Standard Box (2007-2010) generally introduced increased size and refinement. The predecessor, based on earlier GMT800 architecture, was somewhat smaller in overall length and had less ground clearance. The 5850 mm length and 1951 mm height of the GMT900 generation reflect a focus on more interior space, increased towing and payload capacity, and overall sturdiness. Width-wise, the GMT900’s 2032 mm (mirrors opened) is comparable or slightly wider, enhancing stability and road presence. These incremental dimensional improvements helped the Sierra 2500HD maintain competitiveness in the heavy-duty pickup segment by offering better cabin comfort, payload, and off-road capabilities while maintaining the ruggedness expected from its predecessor.

The GMC Sierra 2500HD III Extended Cab Standard Box aligns closely with other American heavy-duty pickups within the same timeframe, such as the Chevrolet Silverado 2500HD and the Ford F-250 Super Duty. Dimensionally, the Sierra’s length of 5850 mm (230.3 inches) and width of 2032 mm (80 inches) place it firmly in the large pickup category, mirroring competitors' sizes necessary for heavy-duty roles. Cargo and cabin space, combined with a ground clearance of 243 mm (9.6 inches), provide competitive off-road and utility abilities. Weight ratings (curb to maximum weight) also parallel rivals, enabling formidable towing and payload. Overall, the Sierra 2500HD performs on par or slightly better in some dimensions compared to competitors, making it a strong choice for buyers seeking a durable, spacious, and capable truck for demanding work or recreation.

The 2007-2010 GMC Sierra 2500HD III Extended Cab Standard Box comes equipped with rim sizes of 6.5J x 16 and 7.5J x 17 inches, fitted with tire sizes of 245/75 R16 and 265/75 R17. These tire dimensions provide a balance between ride comfort, load-carrying capability, and off-road traction. The larger 17-inch rims with wider tires (265 mm width) contribute to increased stability and grip, which is crucial for heavy-duty tasks and towing. Meanwhile, the 16-inch rims with narrower tires offer a slightly softer ride but maintain durability and can be beneficial for rugged conditions. The combination allows versatility depending on driver preference and usage scenarios, supporting the truck's role as a dependable, robust pickup.

The GMC Sierra 2500HD III Extended Cab Standard Box from 2007 to 2010 is designed as a powerful and versatile heavy-duty pickup truck capable of meeting demanding work and recreational needs. It offers a spacious extended cab configuration with folding rear seats for added cargo versatility. The truck is built on the GMT900 platform, emphasizing durability and improved ride quality compared to previous generations. Engine options, typically including strong V8 gasoline and diesel variants, provide high towing and payload capacities, supported by its heavy curb and maximum weight specifications. Safety and convenience features of the era include available traction control, stability systems, and advanced braking. The truck's robust suspension and high ground clearance (243 mm) enable off-road capability while maintaining on-road comfort, making the Sierra 2500HD III a dependable choice for both commercial and personal use.