The system driving manual gearboxes is intricate, involving interlocking teeth and shifting mechanisms. Overdrive is especially valuable for long-distance freeway driving, wherever preserving a higher speed with minimal engine exertion is beneficial.  Numerous manual vehicles have 4 to six forward gears, even though automatics generally have 6 to 8 gears. https://rafaelzejlj.life3dblog.com/32870802/top-guidelines-of-automobile-gearbox