The 2003 GMC Sierra 2500HD SLE Extended Cab Pickup trucks, manufactured in the United States (specifically in Hayden, Idaho), are notable for their robust 8.1-liter Vortec V8 engine coupled with a six-speed manual transmission and dual-range transfer case empowered by an additional Gear Vendors overdrive unit for enhanced off-road capabilities. This heavy-duty, four-wheel-drive truck features distinctive Summit White paint with Pewter cloth interior. Standout equipment includes roof marker lamps, front tow hooks, and vertical camper-style side mirrors.