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2020 GMC Sierra 2500HD AT4 Four-Door Review & Test Drive
Ride along with John Ambrozic from Smail GMC as he gives an in-depth look at the new 2020 GMC Sierra 2500HD AT4 This heavy duty truck boasts a DuraMax 6.6L Turbo-Diesel V8 engine paired with a new 10-speed transmission. For full details on this truck and more, visit https://www.smailbuickgmc.com/VehicleSearchResults?search=new&make=GMC&year ...
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