Offered in regular or heavy-duty guise, the 2000 GMC New Sierra 2500 is a full-size work truck that is fitted with a 285 hp 5.3L V8 as standard equipment. The 2000 GMC New Sierra 2500 Pick-up Truck line-up is diverse. It consists of Regular and Extended Cab body styles, in SL and SLE trims, and in Heavy Duty versions of Regular and Extended Cabs, in SL and SLE trims. If you’re looking to get some serious work done, the New Sierra 2500 is very capable. Under the hood, it comes equipped with a 285 horsepower 5.3-liter gas-powered V8 as standard, mated to a 4-speed automatic.