2007 GMC Sierra 1500 III (GMT900) Regular Cab Long Box Dimensions, Size & Specs

The curb weight of the 2007 GMC Sierra 1500 III Regular Cab Long Box ranges from 2155 kg to 2271 kg (approximately 4750 to 5000 lbs). The maximum gross vehicle weight rating (GVWR) is between 2903 kg and 3084 kg (around 6400 to 6800 lbs). These weight figures reflect the truck's sturdy construction and capability to carry heavy payloads, making it well-suited for towing, hauling, or work-related tasks while still maintaining reliable handling and safety.

The ride height or ground clearance of the 2007 GMC Sierra 1500 III Regular Cab Long Box ranges from 208 mm to 241 mm (8.2 to 9.5 inches). Ground clearance is crucial for off-road capability and driving over uneven terrain without damaging the vehicle's underbody. This clearance is sufficient for moderate off-road use and provides confidence when navigating rough or bumpy roads, typical in worksite environments or rural settings.

This generation of the GMC Sierra 1500 Regular Cab Long Box comes equipped with rims sized at 7.5J x 17 inches and uses tires sized 245/70 R17. These tire dimensions strike a balance between on-road comfort and off-road capability. The relatively tall sidewall of the 70 aspect ratio tires improves cushioning over rough terrain while providing reliable traction and durability under heavy loads.

With rear seats folded, the GMC Sierra 1500 III Regular Cab Long Box from 2007 offers a luggage or cargo capacity of approximately 2138 liters (about 75.5 cubic feet). This volume measurement reflects the usable space available for carrying large loads inside the cab area. Combined with the truck's long box bed, it makes this vehicle ideal for transporting various bulky items, tools, and equipment, fitting the needs of professionals and outdoor enthusiasts.

The height of the 2007 GMC Sierra 1500 III Regular Cab Long Box ranges from 1867 mm to 1876 mm (73.5 to 73.9 inches), and its width with mirrors open is 2031 mm (79.9 inches). Most standard residential garages are about 2.13 meters (7 feet) wide and 2.13 to 2.44 meters (7 to 8 feet) tall, so fitting inside may be tight, especially for garages on the narrower side or those with attic storage. Closing or folding mirrors (if possible) might be necessary to reduce width. In general, while the truck can fit in typical two-car garages, maneuvering in single-car garages may be challenging.

Compared to its predecessor, the GMT800 generation, the 2007 GMC Sierra 1500 III (GMT900) Regular Cab Long Box is generally longer and wider. The length increased to 5702 mm (224.4 inches) from approximately 5720 mm (225.2 inches) on some GMT800 variants but with design updates improving cargo space utility. The width of 2031 mm (79.9 inches) including mirrors reflects a noticeable increase, providing better stability and interior space. Curb weight also saw a moderate rise due to added safety features and reinforced components, improving overall capability and comfort but slightly impacting fuel efficiency.

The 2007 GMC Sierra 1500 III Regular Cab Long Box is competitive in size and capability against similar full-size pickups like the Ford F-150 and Chevrolet Silverado of the same era. Its length of 5702 mm (224.4 inches) and width of 2031 mm (79.9 inches) are on par with or slightly larger than many competitors, offering a spacious cargo bed and cabin. Payload and towing capacities are similarly robust, supported by its weight ratings ranging up to 3084 kg (6800 lbs). Prospective buyers benefit from a solid combination of size, utility, and traditional American pickup truck durability.

As a Regular Cab model, the 2007 GMC Sierra 1500 III offers seating primarily for two to three occupants in a straightforward layout without a rear passenger area. Interior space focuses on front comfort and functionality, featuring a spacious driver's and passenger's area with easy access controls. The lack of rear doors and rear seats maximizes the length of the cargo box behind the cabin, thereby prioritizing hauling capacity over passenger accommodation. While interior amenities vary by trim, the primary advantage is the large cargo bed differentiated from crew or extended cab variants.

The 2007 GMC Sierra 1500 III Regular Cab Long Box is designed with towing and hauling in mind, supported by its maximum weight ratings of up to 3084 kg (6800 lbs). The long box configuration increases cargo capacity, ideal for heavier payloads. The truck’s frame and suspension were engineered to handle demanding work, making it suitable for towing trailers, boats, or equipment. Potential users should consider engine options, drivetrain configurations, and towing packages available during the production to optimize these capabilities. Proper hitching, weight distribution, and safety practices remain essential for safe towing.