Research and/or Engineering Questions/Objective As driveline torsional vibration modes are very critical for RWD vehicle NVH issues, like vehicle shuffle, gear rattle, gear/axle whine, and interior noise booming, it is very helpful to find out how driveline component torsinal stiffness affect driveline torsional vibration modes, that make set the torsional vibration mode target much easier from the very start of driveline development and more effectively tune the driveline torsional vibration modes during refine stage, that way, the major goal of this paper is to find out the RWD driveline torsional vibration mode sensibility to driveline component torsional stiffness, in terms of clutch damper, propshaft, axle shaft and rules how to tune the RWD driveline torsional vibration modes to alleviate torsional vibration induced NVH issues. Methodology A RWD SUV driveline lumped mass model is firstly established to predict the 3 most critical torsional modes, then, in-vehicle torsional vibration measurement in this SUV is implemented, and the correlation between the prediction and measurement is judged to decide whether the model can be employed to make driveline torsinal vibration mode sensibility study to driveline component torsional stiffness or not. If the model is accurate, the clutch torsion damper stiffness, propshaft stiffness, axle shaft stiffness are chosen as the parameter, with stiffness increased/decreased 20–80 % compared to original value, to calculate relevant torsional mode for respective component torsional stiffness, hence, the sensibility study can be implemented. Results The model prediction correlates very well to the in-vehicle torsional vibration measurement, thus, the model is employed to make driveline torsinal vibration mode sensibility study to driveline component torsional stiffness, as aforementioned way of analysis, to conclude how the driveline component torsional stiffness affect the driveline torsional vibration modes. Limitations of this study This study is only limited to RWD driveline, while, FWD driveline is not covered, hence, the FWD driveline torsional vibration mode sensitivity to driveline component torsional stiffness will be the following study. What does the paper offer that is new in the field in comparison to other works of the author This paper involves the systematic study on the driveline component torsional stiffness effect on torsional vibration modes, and give some suggestion addressing the driveline torsional modes from the very start of driveline NVH development, while, the author previous work mainly focused on specific problem solving. In this sense, the work in this paper provides study from new angle. Conclusion (1) axle shaft stiffness is the dominant factor for 1st torsinal mode, say vehicle shuffle (2) clutch torsion damper stiffness is the dominant factor for 2nd torsional mode, say gear rattle (3) propshaft stiffness is the dominant factor for 3rd torsional mode, say axle whine (4) the study outcome is beneficial for driveline NVH target setting and tuning direction for vehicle shuffle, gear rattle, axle whine.