The third-generation Silverado HD arrived for the 2015 model year, with the 6.6-liter Duramax backed by a six-speed Allison 1000 automatic. This 2015 Silverado 3500 LTZ dually is a one-of-a-kind custom SEMA frame-off build, rebuilt from the 2015 truck into a fresh build. It is lifted and finished in blue over a tan interior.