Jeep 2008 Grand Cherokee Owner's Manual page 287

R (Reverse)
Use this range only after the vehicle has come to a
complete stop.
N (Neutral)
Shift into N (Neutral) when the vehicle is standing for
prolonged periods with the engine running. The engine
may be started in this range. Set the parking brake if you
must leave the vehicle.
NOTE: Towing the vehicle, coasting, or driving for any
other reason with selector lever in N (Neutral) can result
in severe transmission damage. Refer to "Recreational
Towing" in Section 5 and "Towing a Disabled Vehicle" in
Section 6 of this manual.
D (Drive)
Shift into D (Drive) only when the vehicle is at a complete
stop and the brakes are firmly applied. The transmission
automatically upshifts through fifth gear. The D (Drive)
position provides optimum driving characteristics under
all normal operating conditions.
Electronic Range Select (ERS)Operation
The Electronic Range Select (ERS) shift control allows
you to move the shifter left (-) or right (+) when the
shifter is in the D (Drive) position, allowing the selection
of the desired top gear. For example, if the driver shifts
the transmission into 3 (third gear), the transmission will
never shift above third gear, but can shift down to 2
(second) or 1 (first), when needed.
When in the D (Drive) position, the first tap to the left (-),
will show the current gear. For example, if you are in D
(Drive) and are in 3rd gear, when you tap the gear shift
one time to the left (-), the display will show 3. Another
tap to the left (-) will shift the transmission into 2nd gear.
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