GMC 1999 Sierra 1500 Pickup Owner's Manual page 240

Your Driving and the Road
Power Winches
i
!
If you wish to use a power winch on your vehicle, only use it when your
vehicle is y
i
NOTICE
Use the regular brakes, set the parking brake or block the wheels to keep
your vehicle from rolling.
Power rake-off (PTO)
Before using a power take-off, refer to the manufacturer's or installer's
instructions.
To engage a power take-off:
1. Set t h s parking brake.
2. Shift the transmission into N (Neutral).
3.
Hold the clutch pedal down and engage the power take-off.
*
If you are going to drive the vehicle, shift the transmission into the gear
you want. Then shift the transfer case into the range you want (if you
have four-wheel-drive), apply the regular brakes and release the parking
brake.
When you release the clutch, the power take-off will start.
4. Release the clutch (and the regular brakes) as you normally would.
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