Chevrolet 1957 Owner's Manual page 13

DRIVING WITH THE OVERDRIVE TRANSMISSION
The optional Overdrive equipment used in con iunction with the
Synchro-Mesh transmission provides an automatic fourth, or cruising,
gear. The engine speed of an Overdrive equipped car is more than
22% slower than thai of a conventional
cor
01
the same road speed. This con-
tributes greatly to fuel economy, reduced
engme wear and quieter, more restful,
driving.
TO DRIVE,
Overdrive Control Handle-with this handle pulled OUT, the
over-
drive mechanism is "locked out" and the car will be in conventional
drive. This handle may be pushed in to engage overdrive 01 any time,
whether car is moving or stationary. When the car is in mot ion, to lock
overdrive mechanism out, press the accelerator to the floor unt il the
transmission kicks down into standard drive, and then pu ll out the
Overdrive Control Handle.
Basic starting and driving instructions while driving with the Overdrive
transmission remain the some os given under "Driving with the Synchro-
Mesh transmission.
IN ADDITION. WITH THE OVERDRIVE MECHANISM
ENGAGED (Overdrive Conlrol Handle "in'');
• At speeds below approximalely 26 miles per hour, all gear
shifting may
be
done without depressing the dutch pedaL
• Above 30 miles per hour the transmission will automatically drop
inlo overdrive when the accelerator pedal is momentarily released,
At this speed and above, the dutch pedal must be depressed before
shifting gears.
• When driving in second or third overdrive, extra power for
acceleration or hill climbing is instantly supplied by depressing
the acceleralor pedelto the floor momentarily.
• As speed drops below 26 miles per hour, the overdrive will
automatically disengage.
TO START ENGINE BY PUSHING CAR
• Follow some procedure as with Synchro-Mesh transmission but, in
addition, LOCK OUT OVERDRIVE by pulling oul overdrive handle.
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