
2020 GMC Sierra 2500HD AT4 - Premium Off-Road Power with Advanced Tech
Drivetrain & Performance
The 2020 GMC Sierra 2500HD AT4 is engineered for rugged strength with a 6.6L V8 Gasoline engine, delivering 401 horsepower and 464 lb-ft of torque, paired to a 6-speed heavy-duty automatic transmission. The X31 Off-Road Package adds skid plates, twin-tube Rancho shocks, hill descent control, and a locking rear differential for superior off-road capability.
Exterior Rugged & Purposeful
The AT4 trim brings bold styling and trail-readiness with features like:
20-inch machined aluminum wheels with all-terrain tires
Red recovery hooks & black chrome exterior accents
Spray-on bedliner with AT4 logo
Power-adjustable trailering mirrors
Technology Package with HD Surround Vision & rear camera mirror
Interior Functional Comfort with Tech
The cabin combines utility and luxury, enhanced by the AT4 Preferred & Premium Packages, which include:
Jet Black leather-appointed front bucket seats with Kalahari accents
Heated & ventilated front seats, heated rear seats
8-inch GMC Infotainment System with Navigation
Bose premium audio system
Wireless charging pad & driver memory settings
Technology & Safety
Packed with smart features from the Driver Alert Packages I & II, the Sierra 2500HD AT4 includes:
Lane Change Alert with Side Blind Zone Alert
Rear Cross Traffic Alert & Front/Rear Park Assist
Forward Collision Alert & Lane Departure Warning
Safety Alert Seat
Heads-Up Display (part of Technology Package)
Capability Highlights:
Integrated trailer brake controller & ProGrade Trailering System
X31 Off-Road Package with Rancho Shocks & Skid Plates
Autotrac 2-speed transfer case with selectable 4WD modes
Key Features Recap
6.6L Gas V8
AT4 Premium, Preferred, and Technology Packages
X31 Off-Road Package with Skid Plates & Rancho Shocks
HD Surround Vision, Head-Up Display, Rear Camera Mirror
Heated/Cooled Leather Seats & Bose Audio
Advanced Driver Assistance with Alert Packages I & II
The 2020 GMC Sierra 2500HD AT4 is a bold, off-road-ready heavy-duty pickup that doesnt compromise on comfort, tech, or capability.