6-Speed Automatic Electronic with Overdrive and 4WD. My! My! My! What a deal! Flex Fuel! In a welcomed nod to those who work hard for their keep, Chevy presents the Silverado 1500. This Silverado 1500 is nicely equipped with features such as 4WD and 6-Speed Automatic Electronic with Overdrive. US News pick for 2011 Best Full Size Truck for the Money. Be prepared to be transformed when you get behind the wheel and feel the power surge right into your very soul as you mash the gas and zoom off over the horizon.