Abstract
Automatic transmission (A/T) is one of the most important of the core components for powertrain of car. The durability of A/T has an effect on the durability of car and Input shaft of A/T passed the power directly from the engine. So the durability of Input shaft for A/T is required. For Securing Durability of Input shaft, the test method of Input shaft is considered and the test results are analyzed. As a result of this study, the reliability of A/T reliability will be improved.