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For decades automotive manufacturers have looked upon metals for use throughout the automobile. Since the time of Henry Ford's Model-T, metals have been used throughout the manufacturing process for their durability and strength. This “metallic mentality” has been challenged in recent years with some success in interior parts and body components. But underhood applications, such as, engine and transmission components have remained primarily in metals with the exception of some thermosets. Until recently, very few thermoplastics have been able to offer the essential, combination of physical and mechanical properties needed for successful replacement of metal parts in powertrain components. Ryton PPS is a high temperature thermoplastic which offers this combination of properties that is needed in such applications. This paper will discuss the advantages of using PPS in powertrain applications.