GMC Sierra AT4
GMC Sierra AT4 models are off-road-oriented variants that combine enhanced capabilities with GMC’s premium refinement to practically complement an authentic outdoor lifestyle
The performance-enhanced pickups made their debut with the 2019 Sierra 1500. Meanwhile, heavy-duty Sierra HD AT4 models entered the market with the arrival of the fourth-generation model, and are expected to receive a refresh for the 2023 model year.
|Available Models:||Sierra 1500, Sierra HD|
|Model Year Availability||2019 – Present|
|Engine(s)||4.3L LV3 V6, 5.3L L82 V8, 5.3L L84 V8, 6.2L L87 V8, 6.6L L8T V8,6.6L L5P Duramax|
|Transmission(s)||6-Speed Auto, 8-Speed Auto, 10-Speed Auto|
|Availability||U.S.A., Canada, Mexico, Middle East|
Sierra 1500 AT4
In 2019, the re-engineered and redesigned Sierra 1500 model introduced the AT4 moniker to the pickup truck model line. The new variant delivered a unique formula of authentic off-road capability paired with premium refinement and the bold appearance that GMC has come to be known for. The model is essentially GMC’s version of the 2019 Silverado Trailboss, but with more premium features and equipment.
Notably, the standard powertrain for the 2019 Sierra 1500 AT4 was and remains the 5.3L V8 L84 engine, though the 6.2L V8 L87 and 3.0L LM2 I6 turbo-diesel Duramax engines were also available. Other available content included a segment-first Multi-Color Head-Up Display as well as a segment-first Rear Camera Mirror and a GMC exclusive, industry-first Carbon Fiber Pickup Box.
In 2020 the Sierra 1500 AT4 saw minor changes and updates, including new trailer tow mirrors that were power-adjustable with heated and auto-dimming upper glass, lower convex mirrors, turn signal indicators, puddle lamps, perimeter lighting, auxiliary lighting and memory with power folding/manual extending functionality. The model also saw standard all-weather floor liners, which featured the AT4 logo and were dealer-installed equipment (LPO-level item).
The 2021 GMC Sierra 1500 AT4 also saw a few minor changes, including the addition of AT4 high clearance step (LPO-level item), and the addition of upgradeable AT4 CarbonPro Edition wheels, allowing buyers to opt for 20-inch 6-spoke Carbon Grey painted aluminum (NZQ) wheels with LT265/60R20 MT blackwall Goodyear Wrangler Territory (QFV) tires rather than the standard AT4 wheel.
- See detailed 2020 GMC Sierra 1500 changes, updates and new features here: 2020 GMC Sierra 1500 change log.
- See detailed 2021 GMC Sierra 1500 changes, updates and new features here: 2021 GMC Sierra 1500 change log.
Sierra HD AT4
The GMC Sierra HD AT4 debuted for the 2020 model year, when the fourth-generation heavy-duty pickup truck lineup entered the market. Like all AT4 models, Sierra HD AT4 features were highlighted by off-road components, and included:
- Off-road suspension, Rancho Shocks, skid plates, Eaton locking rear differential
- Eighteen-inch wheels wrapped with Michelin all-terrain tires
- 20-inch wheels available
- Traction Select System with specific Off-Road mode
- Hill Descent Control and Hill Start Assist
- Segment-exclusive 15-inch diagonal Head-Up Display with Off-Road Inclinometer
- HD Surround Vision for low-speed views of vehicle surroundings
For the 2021 model year, the Sierra HD AT4 pickup received a few minor changes, including the addition of the AT4 high clearance step (LPO-level item), high-gloss Black mirror caps, a new AT4 Premium Plus Package, and revisions to AT4 Preferred Package contents.
Notably, the 2022 GMC Sierra HD AT4 sees no changes, though it is expected to receive a refresh for the 2023 model year.
- See detailed 2021 GMC Sierra 2500HD changes, updates and new features here: 2021 GMC Sierra 2500HD change log.
- See detailed 2021 GMC Sierra 3500HD changes, updates and new features here: 2021 GMC Sierra 3500HD change log.
Discuss GMC Sierra AT4 models in our GMC forum.
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