Chevrolet 1979 Light Duty Truck Owner's Manual page 40

Shift lever positions as shown on the indicator plate on the floor are:
CONVENTIONAL (PART TIME)
NOTICE:
To properly break-in front wheel drive axle components on
conventional four wheel drive models. drive the vehicle the initial 200
miles (320 km) in rear wheel drive (2H) position. If equippe� with free
wheeling hubs the hub should be engaged (in
this initial 200 miles (320 km) and thereafter, monthly for a minimum
of 1 0 miles to ensure proper lubrication.
TRANSFER CASE SHIFT CONTROL
4L-LOW RANGE-ALL F O U R WHEELS DRIVING.
EXCEED 45 MPH.
N- NEUTRAL (FOR USE WITH POWER TAKE O F F IF VEHICLE
IS SO EQUIPPED ) .
2H-HIGH RANGE-NORMAL TWO WHEEL DRIVE
4H-HIGH RANGE-ALL FOUR WHEELS DRIVING
4L AND 4H FOR LOW TRACTION CONDITION ONLY (MUD ,
SNOW DR SAND) NOT RECOMMENDED FOR DRY PAVEMENT.
ALL WHEEL
DRIVE
NEUTRAL
REAR WHEEL
DRIVE
ALL WHEEL
DRIVE
SHIFT PATTERN
PART-TIME
2-10
4H
"LOCK"
position) during
00
NOT