Nylon with various reinforcements is utilized for composite gear preparation; however, the composite specimens have less strength and a higher wear rate. Moreover, the materials and processing costs are high when selecting various mix proportions. Hence, this research has examined the impacts of adding Graphene oxide (GO) and Tungsten disulphide (TD) with Nylon 66 (PA66) on the tribological and mechanical properties. The research aims to identify the best hybrid nylon-reinforced composite specimen for composite gear manufacturing. The GO was prepared by the Modified Hummers-based method and coated with epoxy resin by dip coating. Further, a novel Decision Buffalo-based Mix Selection (DBbMS) has been developed for selecting the best mix proportions to reduce the processing time and material cost. The test specimens are set up by varying the rates of coated GO and TD blended with PA66. In addition, the test examples for tribological and mechanical tests were shaped using an injection moulding machine. The mechanical and tribological properties of PA66, TD, and GO mixed with PA66 hybrid composites were identified. The PA66 composite with 4wt% TD and 15wt% coated GO (PTO-3) uncovered better strengths and higher wear and erosion resistance. In this work, PTO-3 hybrid composite material has been utilized for gear manufacturing.