If your car is making strange noises when shifting gears, it could be due to a number of issues. One common cause is worn out or damaged transmission components, such as the clutch or gears. Additionally, low transmission fluid levels or a faulty transmission fluid pump can also cause strange noises. Problems with the driveshaft or differential can also result in unusual sounds when shifting gears. To determine the root cause of the issue, have your car inspected by a qualified mechanic as soon as possible.