Chevrolet 2008 Corvette Owner's Manual page 94

If your vehicle has a Navigation system, see "Head-Up
Display (HUD)" in the Index of the navigation manual.
The Manual Paddle Shift system will not allow either an
up-shift or a down-shift if the vehicle speed is too
fast or too slow, nor will it allow a start from Fourth (4)
or higher gear
If up-shifting does not occur when needed, the vehicle
speed will be limited to protect the engine.
The transmission will also automatically down-shift as
the vehicle slows down and comes to a stop.
2-30
When using the Manual
Paddle Shift Feature while
in the SPORT MODE (S),
the current gear will be
displayed in the Driver
Information (DIC), or the
Head-Up Display (HUD), if
the vehicle has either of
these features.
When the transmission gear does not respond to a shift
change, the DIC will show an X over the gear display.
If the vehicle has a HUD, and the transmission gear
does not respond to a shift change, then a chime
will sound and the HUD will momentarily show an X
over the gear display.
Manual Paddle Shift operation is available for use with
Cruise Control, see Cruise Control on page 3-11 for
more information.
When a requested shift is
denied due to the speed
restrictions shown, the DIC
will momentarily show
an X over the gear display
and a chime will sound.