This work is a case study of an industry of products for the automotive and white-goods sector, located in the state of São Paulo, Brazil, which is implementing lean manufacturing. The value stream mapping was used to identify all the actions that were in progress and what is the current state of the sector, based on one of its products. Due to the high complexity, the company decided to focus on actions that would bring financial and productive gains, therefore was selected the product family with the most representative sales. It was made a mapping of the current and future status and two significant improvements were identified. The study was supported by Lean Six Sigma tools, 3D simulation software and financial analysis to improve the results and reduce risks. Three scenarios with different improvements were created, the one with greater financial return in less time, productivity gain and alignment with the company's strategic planning has be chosen.