1994 GMC Suburban Owner's Manual - Page 88

If you have four-wheel drive and your transfer case is in " N ' (Neutral), your vehicle will be free to roll, even if your shift lever is in " P ' (Park). So, be sure the transfer case is in a drive gear - not in "N" (Neutral). Follow the proper steps to be sure your vehicle won't move. See "Shifting Into 'P' (Park)" in the Index. If you're pulling a trailer, see "Towing a Trailer" in the Index. Four Wheel Drive If your vehicle has four-wheel drive, you can send your engine's driving power to all four wheels for extratraction. To get themost satisfaction out of four-wheel drive, you must be familiar with it's operation. Read the part that follows before using four-wheel drive. You should use 2H for most normal driving conditions. Rear-wheel antilock brakes do not work when you shift into four-wheel drive. Your rcgular brakes will still work. When you shift back into two-wheel drive, your rear-wheel antilock brakes will take over again. 2-32