2025 GMC Sierra 2500HD AT4 – Thunderstorm Gray with Jet Black/Kalahari Interior

This 2025 GMC Sierra 2500HD AT4 is finished in Thunderstorm Gray with a Jet Black and Kalahari interior and shows approximately 14,500 miles. The Carfax report shows a clean vehicle history. Notable factory equipment includes the AT4 Premium Plus Preferred Package, Technology Package, Snow Plow Prep/Camper Package, 20-inch wheels, MultiPro tailgate, heated and ventilated front seats, heated rear seats, and a head-up display.

Power comes from a 6.6-liter Duramax turbodiesel V8 producing 470 horsepower and 975 lb-ft of torque in stock form, paired with an Allison 10-speed automatic transmission and four-wheel drive. Notable modifications include Motor Ops engine tuning with PPEI transmission tuning, a WCFab Stage 2 high-flow intake system, BDS Suspension 6.5-inch lift with FOX shocks, 37-inch tires, upgraded exhaust, and Scovel Motorsports steering and fitment components. Actual output may differ from factory specifications, as no dyno results were provided.

Inspected Item – Buy with confidence, knowing that this item has been given a full and detailed inspection by a qualified inspector.

Key Details:
Mileage: 14,500
VIN: 1GT4UPEY4SF249401
Title Status: Clean (IL)
Model Year: 2025
Transmission: 10-speed automatic
Fuel: Diesel

Performance & Specifications:
Engine: 6.6-liter Duramax turbodiesel V8
Factory Output: 470 horsepower and 975 lb-ft of torque
Gearbox: Allison 10-speed automatic
Drivetrain: Four-wheel drive
Body Style: Heavy-Duty Pickup Truck

Vehicle History & Condition:
Carfax History: Clean vehicle history report

Known Flaws:
Dent and scuffs on front bumper
Tear in front-end paint protection film
Scratch on passenger-side rear door armrest
Corrosion on some underbody fasteners

Service History:
August 2026 (13,106 miles): Engine oil and filter changed, four-wheel alignment performed
March 2026 (10,320 miles): Engine oil and filter changed, tires rotated, TPMS reset
December 2025 (8,232 miles): Grille replaced or repaired
October 2025 (5,466 miles): Engine oil and filter changed, tires rotated, TPMS reset
June 2025 (1,846 miles): Four-wheel and two-wheel alignments performed

Factory Equipment & Features:
AT4 Premium Plus Preferred Package
Technology Package
Snow Plow Prep/Camper Package
20-inch wheels
MultiPro tailgate
Heated and ventilated front seats
Heated outboard rear seats
Head-up display

Modifications:
Engine & Transmission:
Motor Ops 4-Pack engine tune with Race/Max Effort, Sport Economy, Heavy Tow, and Optimized Stock calibrations
PPEI transmission tuning
WCFab Stage 2 high-flow intake bundle with intake horn, air box, and upgraded intercooler piping
3.5-inch downpipe feeding a 5-inch straight exhaust
FTE 17-inch resonator
Banks dual MAP sensor relocation kit
VSE black catch can with crankcase ventilation upgrade kit
VSE L5P Fuel System Saver

Wheels, Suspension & Steering:
37-inch tires
BDS Suspension 6.5-inch lift kit with FOX 2.0 shocks
BORA 0.65-inch wheel spacers
Cognito PISK steering support kit
Scovel Motorsports and Cognito FOX steering stabilizer
Scovel Motorsports Max Tire Fitment Combo with bumper spacers, fender liner tie-back kit, and mud flap delete caps

Exterior:
Venom Trucks amber daytime running lights
Diode Dynamics smoked running lights
Rough Country tow hook brackets powder-coated in Prismatic Powder Brentwood Orange
GM black badges
American Flag decals
RealTruck soft folding bed cover

Interior:
Banks iDash gauge mounted in a stealth pod
GMC/Kicker interior subwoofer kit
Kicker MultiPro Tailgate Audio System

Other Items Included in Sale:
2 keys
Owner’s manuals
Parts receipts
Spare tire
Tow hooks
Winter grille guard
Engine heater plug
Chrome wheel lugs

This 2025 GMC Sierra 2500HD AT4 combines Duramax diesel performance with an extensive selection of aftermarket upgrades. Its 6.6-liter turbodiesel V8, Allison transmission, BDS 6.5-inch suspension lift, 37-inch tires, custom engine and transmission tuning, and premium AT4 equipment make it a distinctive heavy-duty pickup built for demanding work and off-road capability.

Carfax confirms a clean vehicle history report.