Chevrolet B7 2001 Owner's Manual page 23

Two Speed Rear Axle Electric Shift
-
Control (If Equipped)
If your vehicle is equipped with this feature, you'll find
a label (or labels) that show how to use it on the
headliner above the windshield or in another place near
the driver. Be sure to follow the directions carefully.
The switch for the rear axle shift control is located either
on the shift lever (manual transmission vehicles) or on
the shift tower just to the right of the shift lever
(automatic transmission vehicles).
Automatic
Transmission
1-16
Manual Transmission
When the switch is up, the rear axle is in the high range.
Push it down to switch to the low range.
Air Shift Control (If Equipped)
If your vehicle has a manual transmission and this
feature, you'll find a label (or labels) that show how to
use it on the headliner above the windshield or in
another place near the driver. Make sure you follow the
directions carefully.
When the lever is in HI, the rear axle is in the high
range. Switch it to LOW to get the low range.
The lever for the rear axle
shift control is located
either at the lower right
corner of the instrument
panel cluster or on the
shift lever.