How many letters does the top answer for “a mechanical device for engaging and disengaging gears” have?

The most common answer is gearshift (9 letters).

Crossword clue: a mechanical device for engaging and disengaging gears

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

gearshift 9 letters wn-def

a mechanical device for engaging and disengaging gears

gearstick 9 letters wn-def

a mechanical device for engaging and disengaging gears

shifter 7 letters wn-def

a mechanical device for engaging and disengaging gears