Yes its 4WD. It has the stock Dana 30/Dana 35 combo with the NP231 transfer case. All the fluids have been changed not too long ago by the previous owner. It was on the CARFAX that I got with it. Due to the 5 speed transmission it does have 3.07 gears which are considered highway gears. With those gears and 31s I did manage to make about 19 mpg mixed driving on a recent trip.