2026 GMC Sierra 2500HD AT4

Listed by a franchise dealer in Mount Vernon, IL · On lot for 46 days · VIN verifiable at NHTSA

This new 2026 GMC Sierra 2500HD AT4 is listed at $88,560 by schmidt gmc inc in Mount Vernon, IL 62864. It has 5 miles on the odometer (dealer-reported, not independently verified by OAV). The exterior color is Silver. It features a 4WD drivetrain with a 6.6L V8 engine and Automatic transmission.

OAV's independent, evidence-backed Price-to-Market analysis rates this vehicle as Fair Price — priced at market value. Based on 15 comparable listings matched to this vehicle, the estimated market range is $73,373 to $89,170. The local market range in IL is $78,570 to $83,560. These comparisons match year, make, model, and market, using trim where trim data supports it. OAV does not adjust comparables for odometer — where mileage would distort a verdict, it withholds one instead.

This vehicle has been on the lot for 46 days.

Analysis powered by OAV's patented inventory standardization technology (U.S. Patent No. 12,236,477).

Market context

This listing is part of OAV's broader Mount Vernon, IL trucks market analysis. OAV compares vehicles using local and regional price-to-market ranges, days-on-lot, comparable count, and demand signals where available.

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How this deal is rated

OAV compares this 2026 GMC Sierra 2500HD against similar vehicles currently available in the local and regional market — same make, model, and year range, using trim where trim data supports it. OAV does not adjust comparables for odometer; on very high-mileage vehicles it withholds a verdict rather than overstate a discount the odometer explains. Based on where this listing falls in that comparable set, it is rated:

• Great Deal — priced below the typical range for comparable vehicles.
• Fair Price — priced within the expected range for comparable vehicles.
• Overpriced — priced above the typical range for comparable vehicles.

Listings show OAV's PTM-derived deal quality and live market context. OAV-claimed dealers manage their listing profile and route buyer inquiries directly. Paid OAV partners surface additional verification signals.

How this listing is verified

This vehicle listing was aggregated from a franchise dealer in Mount Vernon, IL, one of 57,000+ U.S. dealerships in OAV's nationwide inventory network.The VIN 1GT4UPEY2TF337509 can be independently verified via the U.S. Department of Transportation's NHTSA VIN decoder, and safety recalls at NHTSA's recall database.

Vehicle attributes (year, make, model, trim, mileage, location) are standardized using OAV's patented methodology (U.S. Patent No. 12,236,477), which normalizes naming conventions and deduplicates cross-listed inventory across the dealership network. Listing data is processed daily; Price-to-Market analysis uses comparable vehicles within the same geographic market.

2026 GMC Sierra 2500HD Market in IL

Based on all 1,134 2024-2028 GMC Sierra 2500HD listings in the IL market, the average asking price is $78,617. This listing at $88,560 is $9,943 above the broader IL average (13% above the IL average). This is a wider, all-trim comparison across IL; OAV's price verdict above uses the closer comparable set. Comparable prices in IL range from $42,990 to $110,438. Similar vehicles spend an average of 74 days on dealer lots in this market.

Similar GMC Sierra 2500HD Listings in IL

8 similar listings shown (closest matches within ±2 model years) and ±30,000 miles (subject trim: AT4 — compare trims below)