Ford 2003 Mustang Owner's Manual page 112

Driving
If the parking brake is fully released, but the
brake warning lamp remains illuminated, the
brakes may not be working properly. See your
dealer or a qualified service technician.
Driving with an automatic overdrive transaxle
Your automatic transaxle electronically controls the
shift feel by using an adaptive learning strategy. This
feature is designed to optimize shift smoothness. It
is normal for your transaxle to shift firmly during the
first few hundred kilometers (miles) of operation
until the adaptive strategy has been learned. The
adaptive learning strategy is maintained by power
from the battery. When the battery is disconnected
or a new battery is installed, the transaxle must
relearn its adaptive strategy. Optimal shifting will
resume within a few hundred kilometers (miles) of
operation.
Your automatic
overdrive transaxle
provides fully
automatic operation in
either (Overdrive)
or D (Drive). Driving
with the shift selector
in (Overdrive) gives
the best fuel economy
for normal driving conditions. For manual control
start in 1 (First) and then shift manually.
If your vehicle is
equipped with a
console mounted
gearshift, you must
press the thumb button
on the side of the
gearshift to move the
gearshift from P
(Park).
112