1998 GMC Suburban Owner's Manual - Page 108

Locking Rear Axle (If Equipped) It can be dangerous to get outyour vehicle if of the shift leveris not fully inPARK (P) with the parking brake firmly set. Your vehiclecan roll. Don't leave your vehicle when the engine is running unlessyou have to. If you've left the engine running, thevehicle can move suddenly. You or others couldbe injured. To be sure your vehicle won't move, even whenyou're on fairly level ground, always set your parking brake and move the shift lever to PARK (P). If you have four-wheel drive and your transfer case is in NEUTRAL (N), your vehicle will be free to roll, even if your shift lever is in PARK (P). So, be sure the transfer case is in a drive gear -- not in NEUTRAL (N). Always set your parking brake. Follow the proper steps to be sure your vehicle won't move. See "Shifting Into PARK (P)" in the Index. If you have this feature, your locking rear axle can give you additional traction on snow, mud, ice, sand or gravel. It works like a standard axle most of the time, but when one of the rear wheels has no traction and the other does, this feature will allow the wheel with traction to move the vehicle. L Windows Manual Windows To open your manual windows, turn the hand crank on each door to raise or lower your side door windows. If you're pulling a trailer, see "Towing a Trailer" in the Index. 2-30