Off-Road in HD: GMC Announces the Sierra HD AT4X and Extreme AEV Edition
The Truth About Cars
MAY 1, 2023
Rugged, off-road-read heavy-duty trucks are nothing new, but GMC’s taking it to the next level with the new Sierra HD AT4X and Extreme AEV Edition trucks. The 2024 GMC Sierra HD AT4X gets a 6.6-liter The 2024 GMC Sierra HD AT4X gets a 6.6-liter liter gas V8 as standard, but buyers can add the 6.6-liter liter Duramax diesel.
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