Powertrain is the major source of noise and vibration in commercial vehicles and has significant contribution on both interior and exterior noise levels. Sound intensity mapping technique identifies and quantifies the spatial distribution of energy radiated by powertrain by means of measurements close to its surface. Based on the quantification, noise sources are ranked, through which Oil sump is identified as one of the major contributors for powertrain noise radiation. Accurate prediction of oil sump modal characteristics is more critical in determining the sound power radiation. This paper discusses about capability of numerical approach in predicting more realistically, oil sump modal characteristics with fluid-structure interaction and consequent verification with experimental modal test results. With this validated model, radiated sound power level of the oil sump has been predicted using acoustic finite element method. Subsequently the paper concludes by comparing the results of baseline with proposed oil sump design with improved noise and vibration characteristics along with weight targets and manufacturability constrains.