1989 GMC Sierra 1500 I (GMT400) Regular cab SWB Sportside Dimensions, Size & Specs

The maximum weight of the 1989 GMC Sierra 1500 I (GMT400) Regular Cab SWB Sportside is 2540 kg (5600 lbs). This weight includes the vehicle's curb weight plus its maximum allowable load, reflecting its capability to handle substantial payloads and towing demands common for trucks in this category.

This model uses tire sizes of 225/75 R15 and 225/75 R16. These tires provide a good balance of road grip, comfort, and load-bearing capacity suitable for the pickup's size and weight. The 15-inch and 16-inch wheel options were standard for this truck generation, allowing some flexibility in tire selection.

Yes, the 1989 GMC Sierra 1500 I Regular Cab SWB Sportside generally fits within a standard garage. Standard residential garages typically measure about 2400-2700 mm (8-9 feet) in width and 4800-6000 mm (16-20 feet) in depth. With a width of 1958 mm and length of 5065 mm, this truck fits comfortably but will take up a significant portion of garage space, so maneuvering around may be somewhat limited.

With a width of 1958 mm (77.1 inches), the 1989 GMC Sierra 1500 I is fairly typical for full-size pickups of the late 1980s. Most competitors in the same segment ranged from about 1900 mm to 2000 mm in width, balancing interior cabin space and road stability without making the vehicle overly wide for standard driving and parking conditions.

The truck stands 1788 mm (70.4 inches) tall. This height allows for a commanding view of the road, aids in off-road capability, and accommodates a robust suspension system. However, it requires owners to consider clearance in low-profile parking garages and when navigating under bridges or canopies, especially when taller tires or accessories are added.

The 1989 GMC Sierra 1500 I measuring 5065 mm (199.4 inches) is slightly longer and more aerodynamically refined than many predecessor models, which typically ranged around 4800 to 5000 mm. This increase in length reflects improvements in cargo bed design and cabin space, offering better functionality while maintaining classic pickup proportions.

When compared to similar pickups from the late '80s, such as the Ford F-150 and Dodge Ram of that time, the Sierra 1500 I is competitive in size and capability. Its dimensions and weight are close to these counterparts, though styling and feature offerings may vary. The GMC is known for its robust build quality and solid on-road performance, making it a popular choice among full-size pickups.

While the exact bed cargo length is not specified here, the 'Sportside' designation typically refers to a stepside bed style, which is narrower but more stylish and can improve maneuverability in tight spaces compared to long beds. The Short Wheelbase (SWB) helps in reducing overall turning radius, enhancing urban usability while retaining good cargo capacity for a variety of haul needs.

The 1989 GMC Sierra 1500 I is part of the GMT400 generation introduced in 1988, known for its updated chassis, improved aerodynamics, and modernized interior relative to older models. It featured upgraded suspension for enhanced ride comfort, available V8 engines with good towing capacity, and a more contemporary exterior design. These improvements made it a competitive full-size pickup during its production run from 1988 to 1992.