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1978 Gmc K15 Suburban Catalog and Classic Car Guide, Ratings and Features

Performance Metrics

Performance: +45
Handling: +40
Ride Comfort: +70

Fundamental Metrics

Safety: +50
Maintenance and Upkeep: +75
Restoration Difficulty: +80

Emotional Appeal

Looks: +60
Collectability: +55
Historical Significance: +30

MMP Rating

5.6 /10
Engine Specifications
Engine Options: 5.7L V8, 6.6L V8, 7.4L V8
Displacement Range: 350 - 454 cu in
Horsepower Range: 145 - 210 hp
Torque: 255 - 355 lb-ft
Compression Ratio: 8.0:1 - 8.5:1
Ignition System: Electronic Ignition
Cooling System: Liquid-cooled
Performance Specifications
0-60 Time: 12 - 15 seconds
1/4 Mile Time: 18 - 20 seconds
Top Speed: 100 mph
Transmission and Drive
Drive Type: 4WD
Transmission Type: 3-speed automatic, 4-speed manual
Fuel and Efficiency
Fuel System Type: Carburetor
MPG: 10 - 12 mpg
Dimensions and Brakes
Brakes: Front disc, rear drum
Wheelbase: 129.5 inches
Weight: 4,500 - 5,000 lbs

Note: Specifications for classic cars are given to the best of our ability, considering the limited and variant data available.

Unearthing the Stalwart of the '70s: The 1978 GMC K15 Suburban

The 1978 GMC K15 Suburban stands as a testament to American automotive resilience, a behemoth that catered to the adventurous and the family-oriented alike. Born from the assembly lines of General Motors, this full-size SUV was a product of a time when cars were a statement of space and capability. As the oil crisis receded, the Suburban emerged as a symbol of regained confidence, offering a blend of utility and comfort that was unmatched by its peers. A notable moment in its history was its embrace by government agencies, which valued its reliability and versatility for demanding work.

Design and Innovation: A Glimpse into the Past

The 1978 GMC K15 Suburban's exterior styling was bold and unapologetic, with a boxy silhouette that exuded strength. Its broad grille and square headlights were hallmarks of the era's design ethos, while the substantial chrome bumpers and trim added a touch of elegance. Inside, passengers were greeted with a functional interior that prioritized durability over luxury, yet the quality of materials used was commendable for its class. Technological features such as optional rear air conditioning and power windows were considered cutting-edge conveniences. The color palette ranged from classic whites and blues to more adventurous shades like Sequoia Green and Russet Metallic. The most iconic body style was arguably the four-door model, which offered easy access to its cavernous interior.

Historical Significance: More Than Just a People Mover

The GMC Suburban's impact on automotive design was profound, setting benchmarks for passenger capacity and cargo space that would influence SUV design for decades. Its truck-based chassis and robust construction enabled it to stand apart from station wagons and vans, offering a unique blend of practicality and ruggedness. The Suburban's legacy is evident in the modern SUV's DNA, where utility meets luxury in a more refined package.

Performance and Handling: A Journey Back in Time

Performance-wise, the 1978 GMC K15 Suburban was not built for speed but for stamina. With a range of engine options, including a 6.6-liter V8, it delivered ample power for towing and traversing challenging terrains. Handling was predictable for a vehicle of its size, with a solid rear axle and leaf springs absorbing most road imperfections. Driving a Suburban was an experience in itself—the rumble of the V8, the commanding view of the road, and the sense of invincibility behind the wheel.

Ownership Experience: The Quintessential Workhorse

The Suburban served many roles—from daily driver to work-site transport to vacation cruiser. Its robust construction meant reliability was a strong suit, though fuel economy was not. Maintenance was straightforward, with parts readily available and simple mechanics that owners could often tend to themselves.

Fun Facts: The Suburban's Place in History

The Suburban has had its share of limelight, including being chosen as the official vehicle for the National Ski Patrol. While not known for setting speed records, it has certainly set standards for longevity—the nameplate is one of the longest-running in automotive history. Criticisms over fuel efficiency were common, yet they did little to dampen its popularity.

Collector's Information: A Growing Niche in Classic Cars

As for collectability, the 1978 GMC K15 Suburban is slowly gaining traction among enthusiasts who appreciate its utilitarian charm. While production numbers were significant, finding one in pristine condition can be challenging. Values can vary widely based on condition, with well-maintained examples fetching anywhere from $15,000 to $30,000 or more. As interest in vintage SUVs grows, so too does the Suburban's potential as an appreciating classic.

Conclusion: The Enduring Legacy of the 1978 GMC K15 Suburban

The 1978 GMC K15 Suburban may not have been the fastest or most luxurious vehicle of its time, but it carved out a niche that has proven to be timeless. Its blend of practicality, reliability, and rugged charm continues to resonate with those who value substance over style. As we reflect on this automotive icon, we're reminded that true greatness often lies in fulfilling a purpose well—and the Suburban did just that.

1978 Gmc K15 Suburban Catalog of Parts

1978 GMC K15 Suburban Hood Adjustment Bolt,Nut and Bumper Pair-HA 5-B 1978 GMC K15 Suburban Hood Adjustment Bolt,Nut and Bumper Pair-HA 5-BHood Adjustment Bolt, Nut and Bumper 5/16-18 x 1 1/2 Bolt, 5/16-18 Nut and Bumper 7/8 x 7/16.

1978 GMC K15 Suburban Front Door Seal (Imported).  Fits either side.  148 Long-IS-LM 121 1978 GMC K15 Suburban Front Door Seal (Imported). Fits either side. 148" Long-IS-LM 121Front Door Seal (Imported). Fits either side. 148" Long. Each

1978 GMC K15 Suburban Upper Door Seal, 78-82 GM Full Size Truck and SUV, Fits Right Side Only, Each-LM 121-J 1978 GMC K15 Suburban Upper Door Seal, 78-82 GM Full Size Truck and SUV, Fits Right Side Only, Each-LM 121-JUpper Door Seal, 78-82 GM Full Size Truck and SUV, Fits Right Side Only, Each. Replaces OEM # 14016512. This seal mounts on the upper part of the passenger (right) door with weatherstrip adhesive glue (not included). This product is made from the original specs and with high quality ozone resistant EPDM rubber for a great fit and long life.

1978 GMC K15 Suburban Upper Door Seal, 78-82 GM Full Size Truck and SUV, Fits Left Side Only, Each-LM 121-K 1978 GMC K15 Suburban Upper Door Seal, 78-82 GM Full Size Truck and SUV, Fits Left Side Only, Each-LM 121-KUpper Door Seal, 78-82 GM Full Size Truck and SUV, Fits Left Side Only, Each. Replaces OEM # 14016511. This seal mounts on the upper part of the driver (left) door with weatherstrip adhesive glue (not included). This product is made from the original specs and with high quality ozone resistant EPDM rubber for a great fit and long life.

1978 GMC K15 Suburban Liftgate Seal, 75-91 GM Suburbans with Liftgate, Each-LM 121-P 1978 GMC K15 Suburban Liftgate Seal, 75-91 GM Suburbans with Liftgate, Each-LM 121-PLiftgate Seal, 75-91 GM Suburbans with Liftgate, Each. Replaces OEM #15594665. This part was designed using the original factory design that consists of the lower clip on seal and upper glass run that are connected as one piece with molded sections.

1978 GMC K15 Suburban Door Handle Gasket Set Fits 73-87 Chevy and GMC Trucks OEM-Style Molded Lip-MP 806 1978 GMC K15 Suburban Door Handle Gasket Set Fits 73-87 Chevy and GMC Trucks OEM-Style Molded Lip-MP 806Each component is built by factory measurements and specifications for a direct-fit replacement and simple installation, focusing on restored authenticity. The top-tier USA Made construction and materials ensure durability and longevity for a long-lived replacement that will far outlast your factory stock models.

1978 GMC K15 Suburban Quarter Window Seal, 75-91 GM Suburban, Fits Left or Right, With Trim Groove-VQT 1975 1978 GMC K15 Suburban Quarter Window Seal, 75-91 GM Suburban, Fits Left or Right, With Trim Groove-VQT 1975Quarter Window Seal, 75-91 GM Suburban, Fits Left or Right, With Trim Groove, Each. Seal goes first on the body then the glass is placed in the opening. Made from original specs and with high quality ozone resistant EPDM rubber for a great fit and long life. This item is designed to be installed during glass replacement.

1978 GMC K15 Suburban Windshield Seal, 73-87 GM Full Size Truck, 73-91 GM SUV, Without Trim Groove-VWS 7313-D 1978 GMC K15 Suburban Windshield Seal, 73-87 GM Full Size Truck, 73-91 GM SUV, Without Trim Groove-VWS 7313-DThis windshield seal goes on the body first then the glass is placed in the opening. Tucking in the self locking strip secures the glass in place. It is a standard black gasket without trim groove. This product is made from the original specs and with high quality ozone resistant materials for a great fit and long life. This item is designed to be installed during glass replacement.

1978 GMC K15 Suburban Window Channel and Sweeper Kit, for Front Doors-WC 5900-15 1978 GMC K15 Suburban Window Channel and Sweeper Kit, for Front Doors-WC 5900-15Window Channel and Sweeper Kit, for Front Doors. 6-Piece Kit

Why Choose Metro?

For over 100 years, Metro Moulded Parts has been the pinnacle of quality in classic car restoration parts. Our commitment to precision and authenticity in every component ensures a perfect fit and an OEM-level appearance.

  • Expert Craftsmanship & Quality: Each part is a testament to our dedication to reliability and perfection, crafted from original designs and thoroughly tested.
  • Advanced Technology: We use cutting-edge techniques to create flawless, long-lasting parts that surpass others in performance.
  • SuperSoft Sponge – The Ultimate Door Seal: Not only are our door seals 30% softer than competitors', but they're also guaranteed to never leak. They effectively reduce wind and road noise, enhancing your classic car's comfort and driving experience.
  • Proudly American: Our parts are a product of American craftsmanship, made in the USA with a spirit of excellence and heritage.
  • Unrivaled Warranty: We back our products with a 30-year industry-leading warranty, a testament to our confidence in their quality.

Join us in preserving the legacy of classic cars with parts that are crafted for perfection, not just made.

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