Global Machinery Company Sierra 1999 - Manual (Page 98)

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NEUTRAL (N): Use this position when you start or
idle your engine.
REVERSE (R): To back up, first press down the clutch
pedal. Wait for the vehicle to stop moving and then, shift
into REVERSE (R). Let up on the clutch pedal slowly
while pressing the accelerator pedal.
NOTICE:
Shift to REVERSE (R) only after your vehicle is
stopped. Shifting to REVERSE (R) while your
vehicle is moving could damage your
transmission.
Also, use REVERSE (R), along with the parking brake,
when turning off your engine and parking your vehicle.
Shift Speeds
CAUTION:
If you skip more than one gear when you
downshift, you could lose control of your vehicle.
You could injure yourself or others. Don’t shift
down more than one gear at a time when you
down shift.
If your engine speed drops below 600 RPM, or if the
engine is not running smoothly, you should downshift to
the next lower gear.