In the ultra-luxury vehicle segment, achieving optimal NVH (Noise, Vibration, and Harshness) performance across a growing range of load cases in drive and regeneration conditions presents significant engineering challenges. As the complexity of load cases escalates with varying torque ripple and transmission errors, traditional time and frequency-domain simulations become computationally inefficient. To address these challenges, an in-house software framework that employs Noise Transfer Functions (NTFs) and Vibration Transfer Functions (VTFs) is developed. The system’s dynamic response is computed once and scaled to various excitation sources, which includes radial and tangential forces derived from EMAG simulations, and gear forces derived from MBS simulation. Speed sweep simulation is performed to systematically characterize the RPM range, allowing for precise scaling of the transfer function against the original forces to obtain the responses in mounts or microphones. The resulting response is built into a color map, and order cuts are performed using a Hanning window, appropriate bandwidth, and auto power spectrum. Recognizing that this approach does not account for manufacturing defects, we implement a non-traditional transfer function methodology known as space order excitation. This method allows for the decomposition of forces into the spatial domain, enabling analysis of the impact of eccentricity, ovality, and breathing. The framework integrates analytical tools, including FFT, Mode Participation Factor, Mode Contribution Factor, and Transfer path contribution for comprehensive root cause analysis. The enhanced efficiency of the simulation significantly reduces computational and post processing time, enabling engineers to focus on detailed NVH issue analysis. This methodology has been validated across various load scenarios, demonstrating its capacity to manage increasing complexity while maintaining accuracy and optimizing simulation time.