There are several signs that the final drive in your car may be failing. These include unusual noises, such as grinding or whining sounds, which could indicate worn gears or bearings. Vibrations or shuddering while driving can also be a sign of a failing final drive. Difficulty turning or steering the car can also be a symptom of a failing final drive, as can leaks or low fluid levels in the final drive. If you notice any of these signs, it's important to have your car inspected by a qualified mechanic to diagnose the problem and prevent further damage to your car's drivetrain.