Implementing Lean Manufacturing systems has become a driving force for achieving low cost production in today's manufacturing environments. The goals of lean manufacturing systems include reducing Work In Process (WIP), reducing non-value added production time, and reducing total operating costs to achieve a more agile and flexible production system. However, a low operating cost system that is not capable of meeting customer demand can become very expensive due to lost sales and market share. Simulation modeling can be used to optimize the process while applying lean manufacturing concepts and achieving throughput requirements. Simulation modeling can determine where a process can afford to become lean while monitoring system responses to ensure system requirements are achieved.