The project addresses the definition of a methodology for the modal characterization of e-axle systems of electric vehicles. The project is developed in collaboration with SKF industrie S.p.a, automotive unit, located in Airasca (TO), in particular with the RTD engineering team. The studied e-axle is composed by the electric motor (rotor and stator), the power electronics (inverter) and the gearbox (reducer and differential). The whole study can be split into two workflows: The first part is the experimental modal analysis. Experimental tests were conducted by means of the modal hammer testing with the e-axle in a free-free boundary condition. Input and output signals have been acquired, then processed and analysed in Matlab in order to obtain the frequency response functions (FRF's).