2011 GMC Sierra 3500HD III (GMT900, facelift 2011) Extended Cab Long Box specs, Fuel consumption, Dimensions
Start of production 2011; End of production 2013 | Pick-up Power: from 360 Hp to 397 Hp Length 6337 mm (249.49 in.); Height 1966 mm (77.4 in.); Wheelbase 4018 mm (158.19 in.);