six Gear Automatic with Overdrive. Come to the experts! All the right ingredients! Want to stretch your purchasing power? Well take a look at this stout 2015 Chevrolet Silverado 3500HD. This truck is nicely equipped with features such as six Gear Automatic with Overdrive. This vehicle is a real laborer of love. Please call to schedule your test drive today! Price does not include any dealer installed accessories, please see dealer for information and demonstration.