Hydromatic automatic transmission burden busy carry too far cogwheel differential differential gear drive exaggerate exhaust fag freewheel gear gear train gearbox gearing gearshift gearwheel go overboard go to extremes go too far high intermediate keep busy know no bounds low neutral oppress overact overcarry overdevelop overdo overelaborate overemphasize overexercise overexert overexpend overindulge overlabor overplay overreact overspend overstrain overstress overstudy overtask overtax overtrain overuse overwork pass all bounds protest too much rack reverse standard transmission stick shift sweat synchromesh task tax transmission work