The challenge to find optimal solutions regarding energy efficiency in vehicle systems such as transmissions, engine and chassis involves the understanding of friction torque, friction losses and loading conditions interactions. Design variables such as internal dimensions, component profile and roughness will lead to a final component from which needs input energy to start and maintain movement. Even a component without load requires a minimal amount of energy and assembled in a vehicle will contribute to fuel consumption and emissions. The same component over loading conditions will turn these values higher due to the energy balance. Using engineering modeling techniques, the loading conditions, such as radial forces and rotation speed were implemented by parametric analysis and a dynamic model was built to obtain the variable contribution in energy-based design. The proposal of this work is to define when the design needs to change in order to attend not only structural, durability and comfort specifications, as well as regional emission standards.