Answer:

GEARS

AnswerCrossword Clue
GEARSBevel and worm
GEARSFirst and reverse
GEARSThey're often switched
GEARSWhat a shift shifts
GEARSTransmission heart
GEARSStick-shift selections
GEARSFirst, second, etc.
GEARSPRNDL picks
GEARSCogwheels
GEARSGets ready, with "up"
GEARSTen-speed parts
GEARSThey have teeth
GEARSThey're meant to be engaged
GEARSTransmission components
GEARSShifting things
GEARSMeshing parts
GEARSThey're shifted
GEARSTransmission units
GEARSFour-on-the-floor options
GEARSShifted car parts
GEARSPark and drive
GEARSWatch innards
GEARSDrive and reverse
GEARSFirst, second, and reverse
GEARSToothed wheels
GEARSEngaging parts
GEARSForward and reverse
GEARSFour-on-the floor quartet
GEARSClockwork components
GEARSTransmission options
GEARSThey may be switched
GEARSThey can be shifted
GEARSFive-speed options
GEARSAuto transmission elements
GEARSBicycle parts
GEARSToothed machine parts
GEARSVideo game franchise ... of War
GEARSThese aren't shiftless
GEARSTransmission adjustments
GEARSEquips