When To Use D (Overdrive) — With Transmission Control Switch Activated (O/D Off Light Illuminated); When To Use 2 (Second); When To Use 1 (Low); P (Park) - Ford 1996 Mustang Manual

However, Overdrive also shifts into a fourth
gear —an overdrive gear — when your vehicle
cruises at an appropriate consistent speed for
any length of time. This fourth gear will increase
your fuel economy when you travel at cruising
speeds.
When to use D (Overdrive) — with
transmission control switch activated (O/D
OFF light illuminated)
Overdrive may not be appropriate for certain
terrain. If the transmission shifts back and forth
between Third and Fourth gears while you are
driving on hilly roads or if your vehicle does
not have adequate power for climbing hills,
depress the TCS.
You can depress the TCS marked "OD" at any
speed.

When to use 2 (Second)

Use 2 (Second) for start-up on slippery roads or
to give you more engine braking to slow your
vehicle on downgrades.

When to use 1 (Low)

Use 1 (Low) when driving down steep grades. It
gives more engine braking to slow your vehicle
than 2 (Second) on the downgrades. You can
upshift from 1 (Low) to 2 (Second) or from 1
(Low) to Overdrive at any speed.

P (Park)

Always come to a complete stop before you shift
into P (Park). Make sure that the gearshift is
securely latched in P (Park). This locks the
transmission and prevents the rear wheels from
rotating.
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