1999 GMC Sierra 1500 Pickup Owner's Manual - Page 106

Featwes & Contmk The front axle portion of the indicatordiagram will light up whenyoushiftinto lighting is four-wheeldrive. A slightdelaybetweenshiftingandtheindicator's up, or if the front axle light does not go normal. If the indicator does not light out after you shift out of four-wheel drive, have your dealer check your system. to theright of Whenyourheadlightsorparkinglightsareon,rotatethedial your headlight switch up to brighten, or down to dim,your transfer case indicator light. Transfer Case Shift Positions 2H (High):Thissetting is fordriving in moststreetandhighwaysituations. Your frontaxleisnotengaged in two-wheeldrive. 4H (High): This setting engages your front axle to help drive your vehicle. as onwet or icyroads,or in Use 4H whenyouneedextratraction,such most off-road situations. N (Neutral):Shift to thissettingonlywhenyourvehicleneeds when usingapowertake off. to betowed or 4L (Low):Thissettingalsoengagesyourfrontaxle to giveyouextratraction, but shouldbeusedonlyfor off-road oronextremelyslipperysurfaces. You canshiftfrom 2H to 4H orfrom 4H to 2H whilethevehicle is moving. if you take your foot off of the accelerator Your front axle will engage faster for a fewsecondsafteryoushift. In extremelycoldweather it may be necessary to stoporslow the vehicle to shift out of 2H. To shift into or out of 4L or N (Neutral): 1. Slowthevehicle to a roll, about 3 mph (5 kmlh)andshiftyour transmissionintoneutral. 2. Shiftthetransfercaseshiftlever in onecontinuousmotion. 4L, oryour Don'tpause in N (Neutral)asyoushiftthetransfercaseinto aears could clash. Kernemberthatdriving in 4H or 4L mayreduce fuel economy. Also, driving in four-wheel drive on dry pavement could cause your tires to wear faster and make your transfer case harder to shift. Front Axle Locking Feature The front axle locks and unlocks automatically whenyoushiftthetransfer to lockorunlock is normal. If the outside case. A slightdelayfortheaxle temperature is veryhot,orthevehiclehasbeenusedunder hard driving conditions,theremaybeaslightdelayfortheaxle to unlock. 2-38