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Pontiac of the Month

Shakercars's 1972 Trans Am

2019 August
of the Month

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2019 GMC Sierra AT4 receives optional off-road performance package

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2019 GMC Sierra AT4 with off-road performance package2019 GMC Sierra AT4 enters winter with the option of some extra underhood oomph. On Monday, GMC debuted its new Off-Road Performance Package available for the Sierra AT4. With the optional package, the most rugged of Sierras makes 435 horsepower and 469 pound-feet of torque. That's up 15 hp and 9 lb-ft over the standard Sierra AT4 when equipped...

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