The Sierra 1500 AT4 is GMC's off road edition of their popular truck. This AT4 has been taken to the next level. Under the hood is the 6.2L V8 that is pumping out 420HP & mated to a 10-speed transmission. It has a 4in lift, custom wheels & tires that were done in house at Dick Norris Buick GMC. Is this 2020 GMC AT$ custom lifted truck worth the price?
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