1998 GMC Safari Owner's Manual - Page 112

Locking Rear Axle (Option) It canbe dangerous toget out of your vehicle if the shift lever not fully inPARK (P) with the is parking brake firmly Your vehicle can roll. set. Don't leave yourvehicle when the engine is running unless you have to. If you've left the engine running, the vehicle can move suddenly. You or otherscould beinjured. To be sure your vehicle won't move, even when you'reon fairly level ground, always set yourparking brake and move the shift lever to PARK (P). Follow the proper steps be sure your vehicle won't to move. See "Shifting Into PARK (P)" in the Index. If you're pulling a trailer, see "Towing a Trailer'' in the Index. This is like four-wheel drive, but there no separate is or lever or switch to engage disengage the front axle. It is fully automatic, and adjusts itself as needed for road conditions. If you have this feature, your locking rear axle give can you additional traction on snow, mud, ice, sand or gravel. It works like a standard axle most the time, of 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. All-Wheel Drive (Option) If your vehicle has all-wheel drive, your engine's driving power is sent to all four wheels for extra traction.