If you are having issues with the clutch or transmission in your vehicle, taking it in for service is a good starting point. A transmission shop can diagnose the problem for you. If poor shifting or slipping is due to a worn clutch, replacing the clutch and taking the time for flywheel resurfacing can significantly improve the vehicle's driveability.  Understanding The Flywheel The engine in your car or truck needs a way to pass the rotational force from the engine to the vehicle's transmission.