Lincoln 1998 Mark VIII Owner's Manual page 100

Driving
D (Overdrive) can be deactivated by O/D
pressing the transmission control
OFF
switch on the side of the gearshift
lever. The Message Center O/D OFF
indicator will illuminate.
D (Drive) – Activate by pressing the transmission control switch on the
side of the gearshift lever. The transmission operates in gears one
through three. D (Drive) provides more engine braking than
(Overdrive) and is useful whenever driving conditions (i.e., city
traffic, hilly terrain, etc.) cause the transmission to excessively shift
between (Overdrive) and D (Drive). Also deactivate (Overdrive)
when:
• driving with a heavy load
• towing a trailer up or down steep hills
• additional engine braking is desired.
To return to (Overdrive) mode, press the transmission control switch.
The Message Center O/D OFF indicator will no longer be illuminated.
Every time the vehicle is shut off and restarted, you must press the
transmission control switch to cancel overdrive operation if driving in
overdrive is not desired.
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