GMC 1996 Sierra Owner's Manual page 214

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