motors and engines for land vehicles, namely, trucks and off-road vehicles; machine couplings and transmission components for land vehicles, namely, gear reducers for land vehicles; [ clutches for land vehicles; ] gears of all types for land vehicles; gearboxes for land vehicles, namely, planetary gearboxes, right angle drives, two-speed gearboxes, gear heads, and, gear reducers for land vehicles; two speed and multi-speed mechanical, electric and hydraulic drive power transmitting mechanisms in the nature of gear reduction units for land vehicles; wheel, track and drum drives for land vehicles; shaft output drives for land vehicles; spindle output drives for land vehicles; compact drives for land vehicles; winch drives for land vehicles; jacking drives for land vehicles; electric drives for land vehicles; compact double and triple reduction drives for land vehicles; add-on adapters for further gear reduction of gear reducers for land vehicles; spring applied hydraulically released static and dynamic brakes for land vehicles; final drives and planetary gear drives for land vehicles for propelling the land vehicle; gears, shafts, gear differentials of all types and components thereof for land vehicles; parts of vehicles of all kinds for locomotion off-highway by land, namely, gears for vehicles, gearing for vehicles, and gear assemblies for vehicles and replacement parts for vehicles, multi-speed and two-speed gear changers used to propel or position vehicles or components thereof and to increase, decrease, or otherwise change or alter the torque or speed of the vehicle or the components thereof in vehicles used on land; transmission components for land vehicles, namely, gears, speed change gears, planet gears, angular gears, two-speed and multi-speed change gears and transmissions, gear heads and associated intermediate gears; force transfer mechanisms for mechanical branch drives in the form of intermediate gears for land vehicles; rear wheel drives and planetary drives for land vehicles; hydraulic, electric and mechanical apparatus for gear changing for land vehicles; and, torque converters, axles, reduction gears, gear and engine torque reducers for land vehicles, namely, trucks and off-highway vehicles