Next, there is no gear change in an automatic transmission motor vehicle, so after you place the transmission into push, every thing else is automatic. Most automobiles use a "P–R–N–D–L" layout for that gear selector, which includes the following positions:[33] Thus, gearbox is critical to control output speed & torque. https://gearboxauto75172.blue-blogs.com/41477822/a-review-of-gearbox-auto