The continuous demand for increase in power output for new wind parks under strict cost constraints, the greater wind resource at elevation and the desire for fewer machines per Mega-Watt to reduce operations resulted in a demand for bigger turbines. The drive train is an important component in realizing reliable and robust wind turbines. This paper investigates a geared wind turbine. In this type a gearbox is used to convert the low rotor speed to the required high generator speed. In the market several solutions are available to constrain the gearbox in the nacelle. The used configuration significantly determines the gearbox response to rotor loads and the transmission of gearbox vibrations to the turbine. This paper investigates the effectiveness of three configurations: the three point mounting, the double bearing configuration and the hydraulic damper system. The flexible multibody modeling technique can be used to accurately characterize gearbox dynamics. The goal of this work is to use an experimentally validated multibody model of a wind turbine drive train as a starting point to characterize the ability of the three configurations to minimize the introduction of non-torque loads in the gearbox and the ability to isolate the high speed shaft initiated gearbox vibrations from the rest of the turbine. A case study with parameter variation was performed on the existing three point mounted NREL GRC drive train. Furthermore some modifications were done to simulate a two bearing configuration and a hydraulic suspension system. We performed a parametric study to visualize the trends governing suspension influences. This paper shows that the two bearing configuration and the hydraulic system generally have lower rear planet carrier bearing response amplitudes than the three point mounting configuration. In addition, the hydraulic system was able to remove an important resonance. The paper concludes with a sensitivity analysis to link the trends above to their driving parameters. (C) 2014 Elsevier Ltd. All rights reserved.