Locking Rear Differential,Four Wheel Drive,Front Tow Hooks,Tires - Front On/Off Road,Tires - Rear On/Off Road,Full Size Spare Tire,Steel Wheels,Power Steering,4-Wheel ABS,4-Wheel Disc Brakes,Auto-On Headlights,Auto-Off Headlights,Daytime Running Lights,Intermittent Wipers,Vinyl Seats,Split Bench Seat,2nd Row Bench Seat,Adjustable Steering Wheel,Vehicle Anti-Theft System,Dual Zone A/C,AM/FM Stereo,Auxiliary Pwr Outlet,Passenger Vanity Mirror,Front Reading Lamps,Driver Air Bag,Passenger Air Bag,Passenger Air Bag On/Off Switch2006 GMC Sierra 3500 4X4. This truck is a beast. Four Wheel Drive, 6.6L Duramax Diesel, Allison Automatic Transmission w/Manual Shift Option, Extended Cab, and a Towing Package. This truck is fresh and clean and still looks brand new. If you are looking for a truck that can work harder than you, then you need to come check this truck out.