Cars & Bids · 2025 GMC Sierra 2500HD AT4 · 3BAONORV

Turbodiesel Power, 4WD, 6.5-Inch Lift, Performance and Exhaust Modifications

This is a 2025 GMC Sierra 2500HD AT4, finished in Thunderstorm Gray with a Jet Black and Kalahari interior.

Highlights
THIS... is a 2025 GMC Sierra 2500HD AT4, finished in Thunderstorm Gray with a Jet Black and Kalahari interior.

- This Sierra is offered with a clean [Carfax](https://www.carfax.com/vehiclehistory/ar20/Xx1VX3GJd0HiCHEDu-ldIwBnY38RLTZte2d_DZ98TT9gxJz5sLURCz1OTNzd24ujgcmgs_IJY_Xv9WHa1De_tehAbwpL9KzgdAmgpfaG) vehicle history report.
- This GMC has been modified with a Motor Ops 4-Pack tune with PPEI transmission tuning, along with a WCFab Stage 2 high-flow intake bundle. Additional notable modifications reported by the ovel Motorsports fitment and steering upgrades.
- According to the window sticker provided in the gallery, this Sierra is a 2500HD AT4 model, and notable factory equipment includes the AT4 Premium Plus Preferred, Technology, and Snow Plow Prep/Camper packages, 20-inch wheels, a MultiPro tailgate, heated and ventilated front seats, heated outboard rear seats, and a head-up display.
- GMC launched the current-generation Sierra for 2019. The truck was again related to the Chevrolet Silverado under the sheet metal, but designers went to great lengths to differentiate the two models; they notably gave the front end a new look. GMC also offered some features that were not available to Chevrolet buyers at launch, like the clever MultiPro tailgate.
- Power comes from a Duramax 6.6-liter turbodiesel V8, rated at 470 horsepower and 975 lb-ft of torque in stock form. Due to the modifications performed to this Sierra, it may produce more power, but a dyno sheet was not provided to confirm. Output is sent to the rear or all four wheels via an Allison 10-speed automatic transmission.

Equipment
This Sierra is a 2500HD AT4 model. A digital window sticker is provided in the photo gallery, and a partial list of notable equipment reported by the

- 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
Notable modifications reported by the

**Packages:**

- Motor Ops 4-pack tune with PPEI transmission tuning, including Race / Max Effort, Sport Economy, Heavy Tow, and Optimized Stock tunes
- WCFab Stage 2 high flow intake bundle, including high flow intake, intake horn, air box, hot-side intercooler pipe, and cold-side intercooler pipe
- Scovel Motorsports Max Tire Fitment Combo, including bumper spacers, fender liner tie-back kit, and mud flap delete caps

**Engine and Transmission:**

- Motor Ops 4-pack engine tuning
- PPEI transmission tuning
- 3.5-inch downpipe feeding a 5-inch straight exhaust
- FTE 17-inch resonator
- WCFab high flow intake
- Banks dual manifold absolute pressure sensor relocation kit
- VSE black catch can with crankcase ventilation upgrade kit
- VSE L5P Fuel System Saver

**Wheels, Suspension, and Brakes:**

- 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

**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

Recent Service History
The attached [Carfax](https://www.carfax.com/vehiclehistory/ar20/Xx1VX3GJd0HiCHEDu-ldIwBnY38RLTZte2d_DZ98TT9gxJz5sLURCz1OTNzd24ujgcmgs_IJY_Xv9WHa1De_tehAbwpL9KzgdAmgpfaG) history report shows that the following services have been performed:

- 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, tire pressure monitoring system reset
- December 2025 (8,232 miles): Grille replaced/repaired
- October 2025 (5,466 miles): Engine oil and filter changed, tires rotated, tire pressure monitoring system reset
- June 2025 (1,846 miles): Four-wheel alignment and two wheel alignment performed

Specifications
- Year: 2025
- Make: GMC
- Model: Sierra
- Trim: 2500HD AT4
- Mileage: 14,500
- Engine: 6.6L Turbodiesel V8
- Transmission: Automatic (10-Speed)
- Drivetrain: 4WD/AWD
- Body style: Truck
- Exterior: Thunderstorm Gray
- Interior: Jet Black/Kalahari
- Title status: Clean (IL)
- Fuel: Diesel
- VIN: 1GT4UPEY4SF249401