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The ALL NEW Sierra 2500HD AT4 is here and GMC is ready for the competition. Under the hood is a 6.6L turbo diesel engine producing 440 HP & mated to a 10-speed automatic transmission. The exterior of the Sierra 2500HD had been redesigned for 2020. The AT4 takes the truck to the next level. On the inside you will find some great tech to help you tow, and some other nice touches. Is the 2020 GMC Sierra 2500HD AT4 the best off road truck money can buy?
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