The system guiding handbook gearboxes is advanced, involving interlocking enamel and shifting mechanisms. Overdrive is especially helpful for extensive-distance freeway driving, in which protecting a large velocity with minimum motor exertion is useful.  The transaxle gearbox combines the transmission and differential into an individual unit. This configuration is widespread in https://griffinttpmh.ageeksblog.com/32818987/about-automobile-gearbox