Abstract: To transmit torque from rotating power source to another device gears or gear trains are used. There are different types of gears such as spur gear, helical gear, double helical gear, bevel gear, crown gear, hypoid gear, worm gear, rack and pinion, epicyclical gear, etc.[4]Designing of gear is such a vast and critical process that whole research coverage in such work is very difficult. To provide speed and torque conversion to output shaft from rotating source, the gearbox is used. Multispeed gearboxes are used in the applications where frequent changes in speed or torque at the output shaft are required. The transmission of motion and power from the input source to output is possible due to the meshing of teeth of the gears.