What Happens When a Universal Joint Wears Out?
Universal joints, often called U-joints, are important parts of a vehicle's driveline. They allow the driveshaft or tailshaft to transfer rotational power while accommodating changes in angle as the vehicle moves. Like other mechanical components, universal joints can wear over time. Once excessive play develops, the joint may cause vibration, clunking, knocking or other driveline symptoms. Understanding the warning signs can help identify a worn universal joint before it contributes to more extensive driveline problems. What Does a Universal Joint Do? A universal joint connects sections of the driveline and allows them to operate at changing angles while continuing to transfer power. This movement is particularly important in rear-wheel-drive and four-wheel-drive vehicles, where the tailshaft needs to accommodate suspension movement while transferring torque from the transmission or transfer case towards the differential. When the joint is operating correctly, power transfer sho...