American Cars

Mercury Sable

D-Day

Geometry

# What does the circle d on the shift column mean?

###### Wiki User

###### September 13, 2007 7:09PM

Overdrive. The transmission contains a final section that causes the output to turn at a faster rate than the input. When this happens it is refered to as "overdriving". Very common in new vehicles as once at speed the overdrive kicks in and the rpms become lower to keep the car at the same speed, hence increasing gas mileage. Press lightly on the accelerator and you can feel the overdrive gear kick out and the car then begins to accelerate. The circle d refers to overdrive gear in your transmission , which is less than a 1:1 or direct drive gear ratio. This gearing lowers your engine rpm for fuel economy but effects pulling power of your vehicle.In a truck there is normally an overdrive disconnect switch on the end of the shift lever.

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### What is the d in a circle for on the gearshift do you drive in that or the plain d?

The D with a circle will allow the transmission to shift into
overdrive which reduces engine RPM"S and will conserve fuel when on
a highway cruise. The D without a circle will not let overdrive
engage. this is useful when traveling on hilly terrain where
overdrive tends to engage and disengage. I usually drive in the
circle mode unless i am climbing uphill and the transmission keeps
downshifting and upshifting. Rule of thumb: Circle D on the
highway, and plain D in the city

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Hope this helped :)
Vicky