The City Lightweight and Innovative Cab (CLIC) project is a scientific collaboration gathering different public and private organizations. The aim is to propose an innovative truck cab responding to new European legislations in security and CO2 emission. A very high strength steel will be used to lighten the structure. This could affects directly the acoustic environment of the cab. In order to control the noise requirements at the design stage, it is then necessary to be able to simulate the vibroacoustic behavior of a truck cab in the mid frequency range. In this context, a methodology is developed at INSA Lyon based on Statistical modal Energy distribution Analysis (SmEdA). This method is considered as substructuring approach for vibroacoustic problems and post-process for finite element methods (FEM). It is based on the knowledge of the uncoupled subsystem modes that can be computed using the FEM. In this paper, one focuses on the fluid-structure coupling of the cab floor with the interior cavity when they are represented by non-coincident meshes.