There is a horizontal lever on the left side of the shift lever. It is identified as the 4WD or transfer case shift lever. While parked or moving at a slow speed you can pull up on this lever one notch. This puts the vehicle in part-time four wheel drive. (this should become indicated by an instrument panel lamp). This is most common for slippery driving conditions. There are other distinct settings that are activated by additionally pulling up on lever additionally. Low 4WD setting requires some lateral movement of the lever as well as upward motion.