1997 GMC Suburban Owner's Manual - Page 237

Power Winches If you wish to use a power winch on your vehicle, only use it when your vehicle is stationary or anchored. ?ower Take-Off (PTO) NOTICE: If you have a PTO that exceed 35 hp installed will on your vehicle, it could damage the transfer case or transmission. When having a PTO installed on your vehicle, make sure that will not exceed it 35 hp. NOTICE: Using a power winch with the transmission in gear may damage the transmission. When operating a power winch, always leave the (N). transmission in NEUTRAL I Use the regular brakes, set the parking brake, or block the wheels to keep your vehicle from rolling. I Before using a PTO, refer to the manufacturer's or installer's instructions. NOTICE: Using a PTO while operating in one place before the vehicle has reached normal operating or temperature can damage the transfer case transmission. If you will be using the PTO while operating in one place, drive and warm up the vehicle before using the PTO. 4-55