6-Speed Automatic Electronic with Overdrive. What a fantastic deal! A great deal in Milton! Confused about which vehicle to buy? Well look no further than this rock solid 2015 Chevrolet Silverado 1500. It is nicely equipped with features such as 6-Speed Automatic Electronic with Overdrive. With plenty of passenger room, ou won't have to worry about being cramped when it's more than just you in the truck. Price does not include tax, itle, nd license fee. Not all customers will qualify for all rebates. Contact dealer for details. $750 - USAA Private Offer. Exp. 09/30, 1,500 - General Motors Consumer Cash Program. Exp. 08/31, 750 - GM National Purchase Bonus Cash. Exp. 08/31