Chevrolet 2002 Silverado 1500 Pickup Owner's Manual page 126

Manual Transfer Case (If Equipped)
The transfer case shift lever is on the floor to the right of
the driver. Use this lever to shift into and out of
-
four wheel drive.
2-46
Some delay between shifting and the indicator's lighting
is normal.
The 4WD indicator will
light up when you shift into
-
four wheel drive and the
front axle engages.