Chevrolet 2005 Silverado 1500 Pickup Owner's Manual page 126

Shifting from 2HI to 4HI
•
Shifts between 2HI and 4HI can be made at any
vehicle speed.
•
It is easiest to shift the transfer case when
maintaining a constant speed or a slight
acceleration. If possible, avoid shifting while slowing
down, as it will may make it harder to shift.
•
Shift your transfer case lever in one continuous
motion into either the 4HI or 2HI position.
•
In extremely cold weather, it may be necessary to
slow or stop the vehicle to shift into 4HI until your
vehicle has warmed up.
•
While in 4HI, your vehicle can be driven at any
posted legal speed limit.
2-40
Shifting In or Out of 4LO
Notice: Shifting the transfer case into 4LO while
moving at speeds faster than 3 mph (5 km/h)
may cause premature wear to the transfer case, and
may cause the gears to grind. To avoid causing
premature wear, and grinding the gears, do not shift
the transfer case into 4LO while the vehicle is
moving faster than 3 mph (5 km/h).
Shifts into 4LO can be made with the vehicle at a stop,
or while slowly rolling about 1 to 3 mph (2 to 5 km/h).
•
Shift the automatic transmission into NEUTRAL (N),
or with a manual transmission, press the clutch
pedal, or shift into NEUTRAL.
•
Shift the transfer case shift lever in one continuous
motion into the 4LO position.
•
When in 4LO do not drive faster than 45 mph.
This will reduce wear and extend the life of
your transfer case.