GMC 2007 Sierra - Manual (Page 156)

When Using the Manual Transfer Case
• Shifting should be made using quick motions.
Shifting slowly may make it more difficult to
shift.
• You may notice that it is harder to shift when
the vehicle is cold. After the vehicle warms
up the shifting will return to normal.
• While in 4H or 4L you may experience
reduced fuel economy.
• Avoid driving in four-wheel drive on clean, dry
pavement. Doing this may cause the tires to
wear faster, and make your transfer case
harder to shift, and run noisier.
Shifting from 2H (Two-Wheel Drive High)
to 4H (Four-Wheel Drive High)
• Shifts between 2H and 4H can be made at
any vehicle speed.
• It is easiest to shift the transfer case when
maintaining a constant speed or during a slight
acceleration. If possible, avoid shifting while
slowing down, as it will make it harder to shift.
• Shift the transfer case lever in one continuous
motion into either the 4H or 2H position.
• In extremely cold weather, it may be necessary
to slow or stop the vehicle to shift into 4H until
your vehicle has warmed up.
• While in 4H, your vehicle can be driven at any
posted legal speed limit.
156