Pre-Owned 2025 GMC Sierra 3500HD AT4 For Sale Mukwonago, WI

Summary2025 GMC Sierra 3500HD AT4 Crew Cab 4WD in Summit White. Duramax 6.6L Turbo-Diesel, Allison 10-Speed, AT4 Premium Plus Pkg, Gooseneck/5th Wheel Pkg, Tech Pkg w/ HUD, Sunroof, MultiPro Tailgate, Snow Plow Prep.Vehicle Details**Uncompromising Heavy-Duty Strength Meets Off-Road Luxury: 2025 GMC Sierra 3500 HD AT4**Built to handle demanding towing tasks while delivering premium comfort, this **2025 GMC Sierra 3500 HD AT4 Crew Cab 4WD** finished in crisp **Summit White** is outfitted with GM's legendary **6.6L Duramax Turbo-Diesel** engine paired to an **Allison 10-Speed Automatic Transmission**. Equipped with top-tier packages including the **AT4 Premium Plus Package**, **Gooseneck/5th Wheel Package**, and **Snow Plow Prep/Camper Package**, this 1-ton powerhouse is ready for heavy equipment, long hauls, and tough weather.**Factory Installed Options & Upgrades*** **Duramax 6.6L Turbo-Diesel Engine:** Proven heavy-duty power and high-torque towing reliability.* **AT4 Premium Plus Package:*** **Technology Package:** Multi-Color 15" Head-Up Display & Rear Camera Mirror.* **Power Sunroof*** **AT4 High Clearance Steps*** **Power Sliding Rear Window*** **LED Roof Marker Lamps** & Universal Home Remote* **Gooseneck / 5th Wheel Package:** Stamped bed holes with caps and 7-pin trailer harness integration.* **Snow Plow Prep / Camper Package:** Dual alternators (220-amp), increased front GAWR, skid plates, and roof emergency light provisions with pass-through.* **GMC MultiPro Tailgate & Factory Spray-On Bedliner:** Enhanced bed functionality with rear wheelhouse liners, cornerstep rear bumper, and 120V cargo bed outlet.* **Dealer-Installed Accessories:** Hitch Package and Lockable Rear Underseat Storage.* **High Idle Switch:** Dedicated control for auxiliary power needs or fast warm-ups.**Cabin Comfort & Cutting-Edge Tech*** **13.4" Diagonal GMC Infotainment Screen** with Google built-in navigation, wireless Apple CarPlay, and wireless Android Auto.* **12.3" Multicolor Driver Information Center** providing real-time vehicle and trailer data.* **Perforated Leather Seating:** 10-way power front bucket seats with heating and ventilation, plus heated rear outboard seats.* **Bose Premium Sound System** & heated, leather-wrapped steering wheel.* **ProGrade Trailering System:** In-vehicle trailering app, integrated trailer brake controller, trailer side blind zone alert, and Trailer Tire Pressure Monitoring System.* **Advanced Driver Safety:** HD Surround Vision, Front Pedestrian Braking, Forward Collision Alert, Lane Departure Warning, Rear Cross Traffic Alert, and Front/Rear Park Assist.Additional InformationLynch Buick GMC of West Bend is a family-owned and operated dealership since 1957. Our dealerships are located throughout Wisconsin, including Lynch GM Superstore in Burlington, Lynch Chevrolet of Mukwonago, Lynch Chrysler Dodge Jeep RAM in Mukwonago, Lynch Ford of Mukwonago, Lynch Buick GMC of West Bend, and Lynch Chevrolet of Kenosha. We strive to provide excellent customer service and the best car-buying experience. At our dealerships, we love our furry friends and offer pet-friendly environments, so bring your pet along with you when you come to visit us! With every service visit, you'll receive a free car wash, and with every vehicle purchase, you’ll Receive our Lynch Pro