2021 GMC Sierra 3500 HD Crew Cab SLT – Duramax Diesel | Off-Road Ready

Now Available at Boyko Motors – Federal Way, WA

Take on the toughest jobs with confidence in this 2021 GMC Sierra 3500 HD Crew Cab SLT, featuring the powerful 6.6L Duramax Turbo-Diesel engine and Allison 10-Speed Automatic Transmission. With advanced towing features, premium comfort, and the rugged X31 Off-Road Package, this heavy-duty truck is built for both work and adventure.

Key Specifications:

• Year: 2021

• Make: GMC

• Model: Sierra 3500 HD Crew Cab

• Trim: SLT

• Exterior Color: Brownstone Metallic

• Interior Color: Dark Walnut/Slate

• Engine: Duramax 6.6L Turbo-Diesel V8

• Transmission: Allison 10-Speed Automatic

• Drivetrain: 4WD

• Rear Axle Ratio: 3.42

• GVWR: 12,250 lbs

Performance & Capability:

• Towing Power: Gooseneck/5th wheel prep package with 20,000+ lbs towing capacity

• X31 Off-Road Package: Rancho shocks, skid plates, hill descent control, and all-terrain tires

• Trailer Ready: ProGrade™ Trailering System, trailer brake controller, and HD Surround Vision with a bed view camera

• 220-Amp Alternator: Ensures consistent power for worksite and off-road needs

• StabiliTrak & Digital Variable Steering Assist: Improves handling and towing stability

Luxury & Technology Features:

• Premium Infotainment System: 8" HD touchscreen with Navigation, Wireless Apple CarPlay & Android Auto

• Bose® Premium Sound System: Crystal-clear audio for an enhanced driving experience

• Heated & Ventilated Leather Seats: Comfortable in all seasons

• Driver Memory Package: Auto-adjust settings for seat and mirrors

• Wireless Charging & USB Ports: Keep devices powered on the go

• Keyless Open, Remote Start, & Push-Button Ignition

Safety & Security Features:

• GMC Safety Package: Lane Change Alert, Side Blind Zone Alert, and Rear Cross Traffic Alert

• Front & Rear Park Assist: Makes parking in tight spots easy

• Teen Driver Mode: Monitors and limits settings for younger drivers

• LED Lighting Package: Includes fog lamps, cargo area lighting, and roof marker lamps for maximum visibility

Exterior Highlights:

• MultiPro Tailgate: Multiple configurations for loading and easy access

• Spray-On Bedliner: Protects the truck bed from wear and tear

• Power Folding & Extendable Trailering Mirrors: Heated with auto-dimming for maximum visibility

• Side Bedsteps & CornerStep Rear Bumper: Provides easy access to the cargo area

• 20” Machined Aluminum Wheels with Accents

Why Buy from Boyko Motors?

✔ Comprehensive Inspections – We ensure top-tier quality and reliability
✔ Flexible Financing – Competitive options tailored to your budget
✔ No Hidden Fees – Honest, upfront pricing on every vehicle

📍 Visit Us Today!

🚘 Boyko Motors – Federal Way, WA
📞 Call us at: (206) 407-7495
🌐 More Details: View Listing

🚛 Your next heavy-duty workhorse is waiting—schedule a test drive today!

SEO-Optimized Keywords:

• 2021 GMC Sierra 3500 HD SLT Duramax Diesel for sale

• Used GMC Sierra 3500 HD Crew Cab in Federal Way, WA

• GMC Sierra 3500 with X31 Off-Road Package near Seattle

• Heavy-duty diesel truck with Allison transmission

Pre-Purchase Inspections (PPI) Welcome and Encouraged
Competitive Lease and Finance Options Available
Extended Warranty Available
Location: Federal Way, WA 98003
Contact: 206-407-7495
Boyko Motors is Family Owned and operated. See us on Facebook and Instagram!