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A new simulation-based method for design of powerplant mounting systems is presented. Unlike traditional methods, in which the objective is to obtain a set of powerplant rigid body modes found from experience to be favorable, this new method directly seeks minimal response in the vehicle passenger compartment, regardless of what powerplant modes are obtained. Therefore, the simulation objective exactly matches the design objective: minimal response. The new method, which uses optimization based on response sensitivities, has been implemented into software. Results show that the final response levels are significantly reduced from the baseline, and that typically the final mounting configuration is much different, and better, than the mounting system that would have resulted from application of the traditional method. POWERPLANT MOUNTING is one of the fundamental design characteristics of a motor vehicle.