The 3500 Classic comes standard with a Vortec 6.0L V8 engine that creates 300hp. It can also be equipped with a Duramax Diesel 6.6L V8 Turbo with Allison six-speed automatic transmission. This boosts horsepower to 360 from the 6.0L V8 engine. The 2500HD Classic is available in WT, LS, 1LT, 2LT, and 3LT trims. Two- or four-wheel drive is an option.Chevrolet Silverado Classics are a continuation of the previous model Silverado.