2019 GMC Sierra 1500 AT4 Changes, Engine & Spy Shots

2019 GMC Sierra 1500 AT4

2019 GMC Sierra 1500 AT4 Changes, Engine & Spy Shots – GMC is now giving an Off-Road Performance package for Sierra AT4 models built with the 6.2-liter V-8 engine which includes an enhanced exhaust, aura ingestion, and 18-in. tires with Goodyear Wrangler DuraTrac wheels. The adjustments put 15 horsepower and 9 lb-ft of torque, generating for …

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