2007 GMC Sierra 3500HD III (GMT900) Crew Cab Long Box Dimensions, Size & Specs

Fitting the 2007 GMC Sierra 3500HD III Crew Cab Long Box into a standard residential garage can be challenging due to its considerable size. With a length of 6572 mm (258.7 inches) and a width of 2436 mm (95.9 inches) including mirrors, it is often longer and wider than standard garage spaces, which typically range from 5500 mm (216 inches) in length and around 2400 mm (94 inches) in width. Additionally, the height near 1931-1934 mm (76 inches) is generally manageable under most garage door heights. Owners of this large truck should verify their garage dimensions to confirm a proper fit and consider door clearance for the mirrors.

The 2007 GMC Sierra 3500HD III's width of 2436 mm (95.9 inches) with mirrors opened significantly affects maneuverability and parking. While the truck’s body width is narrower, the mirrors extend the width, requiring more clearance in tight spaces and urban environments. This extended width must be taken into account when parking in narrow spots, using car wash facilities, or navigating through tight lanes. Drivers should exercise caution and consider mirror retraction (if possible) to reduce width during tight maneuvers.

The 2007 GMC Sierra 3500HD III Crew Cab Long Box offers a ground clearance of 233 mm (9.2 inches), which is substantial for a heavy-duty pickup. This ride height improves its ability to traverse rough terrain, obstacles, and uneven surfaces commonly encountered off-road. It helps protect the vehicle's undercarriage from damage and allows for better approach and departure angles. Combined with its heavy-duty suspension and robust tires, the Sierra 3500HD III is well-suited for demanding work environments and light-to-moderate off-road use.

The curb weight of the 2007 GMC Sierra 3500HD III Crew Cab Long Box ranges from 2734 kg to 3337 kg (6029 to 7359 lbs), while its maximum weight capacity (Gross Vehicle Weight Rating) spans between 4445 kg and 5171 kg (9800 to 11,400 lbs). These figures reflect the truck’s ability to carry heavy loads, tow sizable trailers, and handle demanding work tasks without compromising structural integrity. The heavy curb weight also contributes to excellent stability and traction but can influence fuel economy and handling dynamics, requiring a powerful engine and reinforced components.

Inside the 2007 GMC Sierra 3500HD III Crew Cab Long Box, folding down the rear seats opens up a luggage or cargo capacity of approximately 2170 liters (about 76.6 cubic feet). This substantial space is particularly useful for securely transporting tools, gear, supplies, or any large items that require protection inside the cabin. It complements the large bed of the Long Box variant, making this truck a versatile option for work and recreational uses that demand both cabin and exterior storage.

The 2007 GMC Sierra 3500HD III offers several tire and rim size options suitable for its heavy-duty performance. Rim sizes include 6.5J x 17, 7J x 16, and 7.5J x 17 inches, matched with tire sizes such as 265/75 R16, 265/70 R17, and 225/75 R17. These larger, wider tires enhance traction, load-bearing capacity, and durability, crucial for towing, hauling, and off-road activities. The robust tires and rims also contribute to ride stability and overall vehicle safety under demanding conditions.

Compared to its predecessor generations, the 2007 GMC Sierra 3500HD III (GMT900) Crew Cab Long Box shows notable improvements in size and utility. It is generally larger, especially in length and width, providing enhanced cargo bed space and interior comfort. Engineering advancements also improved payload and towing capacities, reflecting the evolution toward a more capable heavy-duty truck. The third generation features refined styling, updated suspension tuning, and often more powerful engine options, collectively offering better performance, handling, and work capability than earlier models.

The 2007 GMC Sierra 3500HD III Crew Cab Long Box stands competitive among heavy-duty pickups such as the Ford F-350 Super Duty and the Ram 3500. Its length of 6572 mm (258.7 inches) and a width of 2436 mm (95.9 inches) with mirrors open are consistent with other trucks in this segment, balancing cargo capacity with maneuverability. Its payload, towing capability, and interior space are on par or slightly better depending on trims and configurations. While each competitor offers unique features, the Sierra's robust build, strong engine options, and roomy cabin make it a strong contender in the heavy-duty truck market.

The GMC Sierra 3500HD III Crew Cab Long Box offers strong benefits for buyers seeking a heavy-duty pickup between 2007 and 2010. Its generous size provides ample cabin and cargo space, complemented by a solid maximum weight capacity up to 5171 kg (11,400 lbs), making it highly suitable for towing and hauling heavy loads. Versatile tire and rim sizes support various work conditions, while a ground clearance of 233 mm (9.2 inches) enhances off-road capability. Also, the combination of advanced engineering and design improvements over previous generations delivers reliable performance, durability, and driver comfort essential in demanding work and recreational scenarios.