What happens if my U-joint breaks while driving?
What happens if my U-joint breaks while driving? Get it done sooner rather than later - if it breaks completely, the driveshaft will disconnect from the vehicle, which can damage your transmission, the underside of your car, and anything else around it - plus, the vehicle won't be going anywhere until it's fixed. How long can you drive with bad U joint? A car with a bad U-joint will break down in a few hundred miles at the maximum. But if you have a bad U-joint and you are having a transmission fluid leakage, you should not drive your car...