Is the FIRST EVER Sierra AT4 a home run for GMC? Under the hood of this 2019 AT4 is the tried and true 6.2L V8 pumping out 420 HP and mated to a 10-speed automatic transmission. What makes the Sierra AT4 special is it's factory 2in lift and a frame sitting on Rancho monotube off road shock absorbers. Did GMC bring their "A" Game with the 2019 Sierra AT4?
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