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The aim of this paper (which is the continuation of the work presented at the ISATA 2000 International Conference [1]) is to analyse the low frequency driveline torsional vibrations in a vehicle. It is known from many studies and investigations, that the driveline torsional vibrations are mainly responsible of the driver's performance perception and the vehicle's driveability [2, 3, 4]. So many manufacturers use the driveline's response in order to provide their vehicles with characteristics that are specific for the vehicle's segment class and the market. In this regard the vibration's behaviour has been investigated, studying some typical steady and transient vehicle manoeuvres. As a diagnostic guideline for the design's concept development, a driveline simulation model in Matlab/Simulink environment has been implemented. Therefore the basic features has been created to improve a complete vehicle co-simulation, using a engine cycle code and a mechanical driveline model.