Continuing to drive with a worn U-joint can allow additional movement and wear to develop in the driveshaft and related drivetrain components. In more serious cases, a severely worn joint can compromise the connection that allows the driveshaft to transfer power.
If you notice clunking, vibration or other symptoms associated with the driveshaft, Certified Transmission in Bellevue can inspect the system and determine how serious the problem is before additional damage occurs.