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The purpose of this paper is to explain a methodology for diagnosing noise and vibration of internal components of the automatic transaxle and particularly for park disengagement clunk. The method for determining contributing lash is three-fold. First the lash values are physically measured. Secondly, in-vehicle test data is taken using accelerometers, microphones, and stress gages. The data is taken at a baseline condition and then when various lash interfaces are set at zero. Thirdly, component impact testing can be done to identify noise contributing parts. For the condition of park disengagement clunk this method helps to diagnose the source of the noise. When a vehicle is parked on an incline and the transaxle put in park, there is an energy transfer of the weight of the vehicle through the transmission and onto the suspension of the vehicle. When the transmission is pulled out of park, the released energy results in a loud clunk. The clunk has a high and low frequency content.