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This paper describes my attempt to investigate the effect of relief features of different size, location and number through stress and thermal analysis. The study is made through ANSYS using the finite element analysis (FEA) and Lewis Bending equation for calculation of forces involved in gear tooth. The result obtained from ANSYS is compared with the theoretical value of Lewis bending stress for the accuracy of the FEA model. Relief features are tried out with different positions and sizes in the involute spur gear tooth. Readings from ANSYS are tabulated and graphs are plotted. Comparison of graphs from stress and thermal analysis are then done to obtain the optimized result. The optimized position and size of the relief features for pinion is to be determined and its effects on stress and temperature distribution are tested in gearbox test rig.