2025 GMC Sierra 2500HD AT4 Crew Cab 4WD – Duramax Diesel | AT4 Premium Plus | Sunroof

(VDP: 1GT4UPEY0SF276983 31,960 miles)

Overview
This 2025 GMC Sierra 2500HD AT4 Crew Cab 4WD is a nearly-new heavy-duty diesel truck built to conquer the Colorado Rockies and haul anything Denver work or play demands. Powered by the legendary 6.6L Duramax Turbo-Diesel V8 paired with the Allison 10-speed automatic, this AT4 combines serious off-road capability with premium luxury thanks to the AT4 Premium Plus Package, power sunroof, and Technology Package with Head-Up Display. Finished in stunning Volcanic Red Tintcoat over a Jet Black interior with Kalahari accents, it features skid plates, all-terrain tires, the GMC MultiPro tailgate, and an 11,350 lb GVWR ready for serious trailering across the Front Range. With just 31,960 miles, a clean CARFAX showing no accidents, and remaining factory warranty, this Sierra 2500HD delivers massive savings over new MSRP of $87,495. Whether you're towing to Aspen, running a Denver job site, or heading up to the high country, this AT4 is Colorado-ready right now at Mile High Car Helper.

Vehicle Walkaround Video

Vehicle Details
• VIN: 1GT4UPEY0SF276983
• Engine: Duramax 6.6L Turbo-Diesel V8
• Transmission: Allison 10-Speed Automatic
• Drivetrain: 4WD with 2-Speed Autotrac Transfer Case
• Exterior Color: Volcanic Red Tintcoat
• Interior Color: Jet Black with Kalahari Accents
• Odometer: 31,960 miles
• AT4 Premium Plus Package
• Preferred Package: Universal Home Remote, Power Sliding Rear Window, LED Roof Marker Lamps
• Power Sunroof
• Technology Package: Rear Camera Mirror, Multi-Color Head-Up Display
• AT4 High Clearance Step (Dealer Installed)
• All-Weather Floor Liners
• Trailering Wiring Provisions
• Rear Axle 3.42 Ratio
• GVWR 11,350 lbs
• Auto Locking Rear Differential
• Traction Select System with Off-Road & Tow-Haul Mode
• 220 Amp Alternator
• 120V Power Outlets in Cargo Bed and Instrument Panel
• Heavy-Duty Air Cleaner
• Skid Plates
• StabiliTrak with Trailer Sway Control & Hill Start Assist
• Digital Variable Steering Assist
• All-Terrain Tires
• Trailering Package with Trailer Brake Controller
• Vehicle Trailering App
• Premium GMC Infotainment System with 13.4" Touchscreen
• Google Built-In Compatibility with Navigation
• Wireless Apple CarPlay & Wireless Android Auto
• Bluetooth
• 8 Years OnStar Basics
• SiriusXM with Trial Subscription
• Bose Premium Sound System
• 12.3" Color Driver Info Center
• Remote Keyless Open and Start
• Rear Seat Reminder
• Dual Zone Climate Control
• 10-Way Power Front Bucket Seats
• Heated Front & Rear Outer Seats
• Ventilated Front Seats
• 60/40 Rear Folding Bench Seat with Storage Package
• Driver Seat & Mirror Memory
• Wrapped & Heated Steering Wheel
• CornerStep Rear Bumper
• Power Fold/Extend & Heated Trailer Mirrors with Auto-Dim
• LED Fog Lamps
• LED Cargo Area Lighting
• Red Front Recovery Hooks
• Rear-Window Defogger
• Rear Wheelhouse Liners
• GMC MultiPro Tailgate
• Spray-On Bedliner
• Animated LED Projector Headlamps
• Forward Collision Alert
• Following Distance Indicator
• Front Pedestrian Braking
• IntelliBeam Auto High Beams
• Lane Departure Warning
• Automatic Emergency Braking
• Teen Driver Mode
• Safety Alert Seat
• Rear Cross Traffic Alert
• HD Surround Vision
• Front & Rear Park Assist
• Trailer Side Blind Zone Alert
• Buckle to Drive

Mike's Notes
I personally inspected this Volcanic Red Tintcoat AT4 the day it arrived on our lot, and let me tell you — for a 2025 with under 32,000 miles, this truck presents like it just rolled off the showroom floor. The CARFAX is clean with no accidents, and I love that the previous owner treated it right — records show regular oil changes, tire rotations, and even a proactive rear shock replacement done recently at John Elway Chevrolet before we got it. The AT4 Premium Plus loadout is the one you want: power sunroof, Head-Up Display, rear camera mirror, ventilated and heated seats front and rear, and that gorgeous 13.4-inch touchscreen with Google Built-In. Under the hood, the Duramax 6.6L diesel with the Allison 10-speed is the gold standard for hauling into the mountains — you can tow your fifth-wheel to Steamboat without breaking a sweat. Best of all, there's still factory warranty remaining, and we're pricing this well below a comparable new build that stickered at $87,495. Come drive it — trucks like this don't sit long in Denver.

Features and Benefits
• Duramax 6.6L Turbo-Diesel V8 with Allison 10-Speed – Legendary torque and towing power for hauling trailers over Vail Pass and Loveland Pass without losing steam at altitude
• 4WD with 2-Speed Autotrac Transfer Case – Confident traction on Colorado's snowy roads and true off-road capability for weekend trips to the high country
• AT4 Off-Road Package with Skid Plates & All-Terrain Tires – Ready to tackle Rocky Mountain trails, fire roads, and jobsites without a single aftermarket upgrade
• Heated & Ventilated Front Seats + Heated Rear Seats – Toasty comfort during frigid Denver winters and cool relief on hot summer drives to the Western Slope
• Heated Steering Wheel – Warm hands from the moment you start the truck on those single-digit January mornings
• Power Sunroof – Open-air views of the Rockies and Colorado's 300+ days of sunshine per year
• Multi-Color Head-Up Display – Keep your eyes on winding mountain roads while critical info stays in your line of sight
• 13.4" Touchscreen with Google Built-In & Wireless CarPlay/Android Auto – Seamless navigation to any Colorado trailhead or worksite without fumbling with cables
• Bose Premium Sound System – Concert-quality audio for long hauls to Grand Junction or road trips through the mountains
• Integrated Trailer Brake Controller & Trailering Package – Safely tow up to your rated capacity with confidence — perfect for boats, RVs, and equipment trailers
• GMC MultiPro Tailgate – Six different configurations make loading gear, sitting for tailgates, or accessing your bed dramatically easier
• Spray-On Bedliner – Protects your bed from tools, gravel, and gear so the truck holds its value on Denver's tough used market
• HD Surround Vision & Front/Rear Park Assist – Maneuver this big HD truck confidently in tight downtown Denver parking garages and jobsite lots
• Full Suite of Driver Safety Tech – Automatic emergency braking, lane departure warning, and blind zone alerts add peace of mind for daily commutes and highway hauling
• Remaining Factory Warranty – Approximately 22 months of bumper-to-bumper coverage plus long powertrain warranty for worry-free ownership
• Clean CARFAX — No Accidents – Buy with total confidence knowing this Sierra has a spotless history and documented service records

Fully serviced, professionally detailed, and road-ready — this vehicle represents Mile High Car Helper's commitment to quality, value, and transparency.

Dealer Details
Visit our indoor Denver showroom to experience this vehicle in person.

Mile High Car Helper
1709 S Acoma St, Denver, CO 80223
Call/Text: 720-605-1749
www.milehighcarhelper.com

Hours: Mon–Fri 10 AM–6 PM | Sat 10 AM–5 PM | Closed Sunday

We offer local credit union financing, nationwide shipping, and full in-house services including detailing, paintless dent repair, window tint, and clear mask.