ZF Friedrichshafen AG is a German technology manufacturing company that supplies systems, in particular transmissions for buses, passenger cars and SUVs, light commercial vehicles such as vans and light trucks, as well as all types of heavy and special vehicles.
Basically there are two types of motor vehicle transmissions: Basically there are two types of engine installation: Every type of transmission occurs in every type of installation.
These are for heavy motor vehicles; such as large goods vehicles (trucks), buses, motorcoaches, agricultural machinery, plant equipment (such as earth movers), or specialist military vehicles such as tanks.
TD: Truck transmission with direct drive top gear TO: Truck transmission with overdrive top gear References: [46][47][48]