Meet the 2025 GMC Sierra 3500HD AT4, a heavy-duty truck engineered for those who demand capability without compromise. This Thunderstorm Gray powerhouse combines advanced technology, genuine comfort, and the rugged performance you need for work or adventure.
- Duramax 6.6L V8 Turbodiesel engine delivering 470 hp and 975 lb-ft of torque
- 10-Speed Automatic transmission with 4WD for confident traction in any condition
- AT4 Premium Plus Package with power sunroof and premium technology features
- Gooseneck/5th Wheel Prep Package for seamless towing integration
- Bose Premium 7-Speaker Sound System with SiriusXM 360L trial subscription
- GMC Premium 13.4" Diagonal Information Display and 15" Multicolor Head-Up Display
- Heated and ventilated leather front seats with 10-way power adjustment and lumbar support
- HD Surround Vision with Bed View Camera and dual trailer camera provisions
- Automatic Emergency Braking, Lane Departure Warning, and Rear Cross Traffic Alert
- Heated steering wheel and premium front floor liners with removable carpet inserts
- Off-Road High Clearance Step and X31 Off-Road Package for superior capability
- Dual 220-amp primary and 170-amp auxiliary alternators for heavy electrical demands
- Engine Block Heater, High Idle Switch, and Exhaust Brake for diesel performance
- Remote Vehicle Starter System and wireless phone projection for convenience
- 20" High Gloss Black aluminum wheels with Spray-On Pickup Bedliner featuring GMC logo
This Sierra 3500HD AT4 arrives as a certified pre-owned vehicle, backed by GMC's commitment to quality and reliability. Every system has been thoroughly inspected and conditioned to meet our exacting standards, giving you confidence in your investment and peace of mind for years to come.
The AT4 trim distinguishes itself with genuine off-road capability paired with luxurious appointments. The advanced suspension system, combined with the available X31 Off-Road Package, ensures this truck handles challenging terrain while maintaining the refined ride quality you appreciate during daily driving. Whether navigating job sites or mountain passes, you control the environment rather than letting it control you.
Inside, the cabin reflects careful attention to driver-focused design. The heated steering wheel, advanced climate control with front dual-zone air conditioning, and memory seat functions adapt to your preferences. The 15" Head-Up Display keeps critical information in your line of sight, while the Technology Package integrates your digital life seamlessly with wireless phone projection and multiple USB charging ports throughout the cabin.
The gooseneck hitch platform and fifth-wheel prep package transform this truck into a serious towing platform. Whether you're hauling a gooseneck trailer or fifth-wheel RV, the integrated hitch camera provisions and trailer side blind zone alert take the guesswork out of maneuvering heavy loads. The dual alternators ensure your electrical system handles demanding accessories and equipment without compromise.
This 2025 Sierra 3500HD AT4 represents everything GMC built this truck to be: uncompromising performance, genuine luxury, and the capability to handle whatever you ask of it. We invite you to experience it firsthand in our showroom.
2025 GMC Sierra 3500 HD AT4 4x4
- Certified vehicle
- Diesel
$74,389Sale Price
$74,988Net Price
Johnson Auto Plaza
Call 303-654-1940
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The overview
- Thunderstorm Gray Exterior
- Jet Black Interior
- 33,964 miles Odometer
- Truck Crew Cab/5 seats
- 5 seats
- 10-Speed Automatic
- 4x4
- V-8 cyl Engine
- VIN 1GT4UVEY1SF202721
- Stock # 16569Z
The highlights
- Lane departure
- Leather upholstery
- Automatic temperature control
- Wireless phone connectivity
- Parking sensors
- Exterior parking camera front
- Exterior parking camera left
- Exterior parking camera right
- Exterior parking camera rear
- Front dual zone A/C
- Auto high-beam headlights
- Rain sensing wipers
The full specifications
- 1-touch down
- 1-touch up
- Adaptive Cruise Control
- Air conditioning
- Auto-dimming rearview mirror
- Automatic temperature control
- Driver door bin
- Driver vanity mirror
- Front beverage holders
- Front dual zone A/C
- Heated steering wheel
- Illuminated entry
- Memory seat
- Overhead console
- Passenger door bin
- Passenger vanity mirror
- Power windows
- Proximity key: doors and push button start
- Rear beverage holders
- Rear door bins
- Remote engine start
- Remote keyless entry
- Speed control
- Surround View Monitor
- Telescoping steering wheel
- Tilt steering wheel
- Alloy wheels
- Front anti-roll bar
- Front tires: 275/65SR20.0E
- Front wheel independent suspension
- Power steering
- Rear tires: 275/65SR20.0E
- Single rear wheels
- Speed-sensing steering
- Tires: all-terrain
- Wheel size: 20"
- 1st row LCD monitors: 2
- AM/FM radio: SiriusXM with 360L
- Primary LCD size: 13.4"
- Smart device integration
- Speaker type: Bose
- Speakers: 7
- Steering wheel mounted audio controls
- Wireless Phone Charger: front
- Wireless phone connectivity
- Front center armrest
- Front seats: bucket
- Heated front seats
- Heated rear seats
- Leather upholstery
- Max seating capacity: 5
- Power 2-way driver lumbar support
- Power 2-way passenger lumbar support
- Power driver seat
- Power passenger seat
- Rear seat center armrest
- Rear seats: split-bench
- Rear seats Folding position: fold-up cushion
- Seat Upholstery: leather
- Split folding rear seat
- Ventilated front seats
- Cylinder configuration: V-8
- Drive type: four-wheel
- Engine liters: 6.6L
- Engine location: front
- Fuel tank capacity: 36.0gal.
- Hybrid traction battery type: none
- Manual-shift auto
- Mode select transmission
- Rear locking differential
- Transmission: 10 speed automatic
- Variable valve control
- Ground clearance (min): 284mm (11.2")
- Auto-dimming door mirrors
- Bedliner
- Bumpers: body-color
- Heated door mirrors
- Hitch Class: IV
- Left rear passenger door: conventional
- Power door mirrors
- Rear cargo: tailgate
- Rear step bumper
- Right rear passenger: conventional
- Skid plates
- Trailer hitch
- Trailer sway control
- Turn signal indicator mirrors
- Engine displacement: 6.6 L
- Exterior body width: 2,079mm (81.8")
- Exterior height: 2,054mm (80.9")
- Exterior length: 6,369mm (250.8")
- Front headroom: 1,093mm (43.0")
- Front hiproom: 1,554mm (61.2")
- Front legroom: 1,131mm (44.5")
- Front shoulder room: 1,677mm (66.0")
- Rear headroom: 1,019mm (40.1")
- Rear hiproom: 1,530mm (60.2")
- Rear legroom: 1,102mm (43.4")
- Rear shoulder room: 1,659mm (65.3")
- Turning radius: 8.0m (26.3')
- Wheelbase: 4,039mm (159.0")
- Appearance: digital/analog
- Auto high-beam headlights
- Blind spot: warning
- Compass
- Configurable
- Delay-off headlights
- Exterior parking camera cargo
- Exterior parking camera front
- Exterior parking camera left
- Exterior parking camera rear
- Exterior parking camera right
- Front fog lights
- Front reading lights
- Fully automatic headlights
- Lane departure: warning
- Low tire pressure warning
- Oil pressure gauge
- Outside temperature display
- Parking sensors: front and rear
- Rain sensing wipers
- Rear reading lights
- Rear window defroster
- Tachometer
- Trip computer
- Variably intermittent wipers
- Voltmeter
- 4 wheel disc brakes
- ABS brakes
- Brake assist
- Dual front impact airbags
- Dual front side impact airbags
- Electronic stability
- Forward collision: mitigation
- Front pedestrian detection: prevention
- Ignition disable
- Occupant sensing airbag
- Overhead airbag
- Panic alarm
- Perimeter/approach lights
- Rear collision: warning
- Security system
- Traction control
Notes from the dealer
Peace of mind
Vehicle history report
- Title information
- Odometer readings
- Accident data (if applicable)
- Service history
- Vehicle usage
- Recall information (if applicable)
- Warranty status
A name you can trust
Johnson Auto Plaza is dedicated to your satisfaction before, during, and after your purchase. We'll go the extra mile to take care of you.
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