
- 2021 GMC Sierra 1500 Crew Cab SLT Harley Davidson Edition
- Duramax 3.0L I6 Turbo Diesel
- 10-Speed Automatic
- RWD w/ 4x4
- Oynx Black Exterior
- Jet Black Interior
- SLT Premium Plus Package
- Power Sunroof
- X31 Off-Road Package
- All-Weather Floor Liners
- Harley-Davidson Edition Visual Appearance Package
- 22" "Fat-Boy" Milled Aluminum Wheels
- BDS Suspension System w/ Fox® Performance Shocks
- Harley-Davidson–Specific Grille Design
- Harley-Davidson Badging
- Harley-Davidson Exclusive Interior Trim
This 2021 GMC Sierra 1500 Crew Cab SLT stands out through a licensed Harley-Davidson Edition visual appearance package that transforms GMC’s refined full-size pickup into a bold, lifestyle-driven statement truck. Built on the SLT Premium Plus platform and powered by the 3.0L turbocharged Duramax inline-6 diesel, this configuration is notable for delivering 460 lb-ft of torque while achieving fuel economy figures that rival midsize trucks, making it one of the most efficient diesel half-tons of its era. The combination of the factory X31 Off-Road Package with a BDS suspension system and Fox performance shocks gives the truck a visibly elevated stance without compromising everyday drivability, while 22-inch Harley-Davidson “Fat-Boy” milled aluminum wheels and exclusive branding create an immediately recognizable presence. Applied post-production by a licensed upfitter, the Harley-Davidson Edition adds rarity and visual distinction, blending GMC’s durability and comfort with Harley-Davidson’s unmistakable design identity in a package that prioritizes character and long-distance capability over factory performance theatrics.
Exterior and Interior
Finished in Onyx Black, the exterior of this 2021 GMC Sierra 1500 is distinguished by a Harley-Davidson–specific grille design, exclusive badging, and custom visual accents that separate it from standard SLT, AT4, and Denali models. The appearance package is complemented by 22-inch “Fat-Boy” milled aluminum wheels, a lifted stance provided by a BDS suspension system with Fox performance shocks, and aggressive all-terrain tires. These upgrades give the truck a commanding road presence without altering its core factory structure. Inside, the Jet Black interior features Harley-Davidson–exclusive trim elements and subtle branding layered over the SLT Premium Plus Package, which includes upgraded materials, comfort features, and advanced infotainment, along with a power sunroof that enhances the cabin’s open, upscale feel.
Engine
Under the hood, the Sierra is powered by the 3.0L turbocharged Duramax inline-6 diesel engine, known for its strong low-end torque, smooth power delivery, and impressive fuel efficiency for a full-size pickup. The engine is paired with a 10-speed automatic transmission and a selectable 4WD system, offering versatility across highway cruising, towing, and light off-road use. The X31 Off-Road Package adds functional enhancements such as skid plates and revised suspension tuning, while the BDS suspension and Fox shocks included with the Harley-Davidson Edition further elevate ride height and visual impact. Importantly, the drivetrain and engine remain stock to GMC factory specifications, preserving reliability, serviceability, and long-term ownership confidence.
Inspection
Built to tackle the toughest jobs of its era, the 1968 GMC C3500 represents a time when durability and simplicity defined American heavy-duty trucks. Today, examples like this have become increasingly sought after thanks to their unmistakable styling and endless versatility. Showing 108,258 miles, this C3500 has been tastefully customized with a rugged flatbed while retaining its hardworking character. Power comes from a 350ci V8 backed by a 4-speed manual transmission, making it equally at home hauling equipment, attending truck shows, or serving as a standout addition to any vintage collection.
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