This paper consists of designing of nine speed gearbox and the procedure for calculating the number of teeth on gear including structure and ray diagram. For analysis, the gearbox assembly is created in CATIA and Analysis is performed in ANSYS. Also deformation is attained as the gear efficiency depends on the deformation. A mechanical device called a gearbox that transforms the torque and speed of a rotary power generator to the output shaft. The torque transferred reduces when there is a rise in shaft speed, and likewise. Multi-speed gearboxes are utilized in cases where the speed or the torque there at the output shaft must be varied often. Gearboxes operate on the idea of teeth meshing, resulting in power transfer and the motion transfer from the input source toward the outputs. To achieve the needed speed differences, a gearbox is constructed by attaching several gears in a proper speed ratio. Gearboxes often feature many groups of gears that are strategically arranged to achieve various speed variations. The synchromesh, Sliding mesh, and constant mesh gearboxes are the three kinds of gearboxes. Sliding and stationary gears are the two main types of gears in a sliding mesh gearbox. Sliding gears are installed on splined shafts so that they may move along the shaft's axis and mesh with possible combinations of gear. The result shows     that the deformation, maximum stresses and elastic strain are under safe limits.