U-joint failure is a serious issue. When a U-joint on your vehicle fails, you could be left stranded on the side of the road. U-joint failure happens for a few different reasons:
· The vehicle has high mileage
· The vehicle has been in several accidents that caused misalignment
· The u-joint loses grease
· The operating angle is too steep
Signs Of A Failing U-Joint
There are some common indicators that a U-joint is about to fail. The bad news is that by the time you detect the symptoms of a deteriorating U-joint, it is already too late. The joint will require replacement. However, replacing the joint as soon as possible can help prevent future difficulties.
If you detect shaking or vibration while driving, it may indicate that your U-joint is going to break. If your car vibrates unusually while driving, inspect your tires for balance and alignment issues. If there are none, the problem could be due to a malfunctioning u-joint. That indicates you should have it checked out quickly to avoid causing further damage.
Driving with a failing u-joint will cause more strain on other components in the drivetrain system. This can lead to other problems such as:
· Severe drivetrain vibrations at certain speeds
· Leaking pinion or transmission seals
· Damage to the driveshaft
Another key indicator of a faulty u-joint is a variety of unusual noises. One of the most typical noises is a clunking sound when switching from forward to reverse.
When a U-joint ultimately fails, it produces a loud popping noise. It may then literally collapse. If this happens while you're driving, you could lose control of your vehicle. You'll also end up stranded on the side of the road since your vehicle can no longer move. A faulty u-joint can potentially cause additional issues. To be specific:
Driveshaft Gets Disconnected
This is the reason why your vehicle stops moving after a U-joint fails. The driveshaft can't transfer to the axle when the u-joint fails. The driveshaft is usually still connected at one end but is completely free at the end where the u-joint failed.
Transmission/Transfer Case Output Shaft Seal Failure
When a U-joint fails, it produces excessive vibration. This can cause the driveshaft's output shaft to turn out of round. This results in the failure of the transmission's rear seal.
If not addressed in a timely manner, this can result in complete transmission failure. It's because when the output shaft rotates out of round and the rear seal fails, transmission fluid spills. When the transmission loses enough fluid, it may fail.
Pinion Seal Failure
The excessive vibration from a bad u-joint can cause the pinion seal to fail. When that happens, gear lube can leak out of the differential. This can lead to significant damage to the ring and pinion assembly.
Bearing Failure

The excessive vibration from a bad u-joint can cause the following bearings to fail:
· Pinion bearing
· Transfer case output bearing
· Transmission output bearing
U-joint failure leads to expensive repairs. It also makes driving dangerous and difficult for you and everyone else on the road. This is why you need to address a bad u-joint as soon as you notice the signs of a failing u-joint.
Wenqi Machinery, a Chinese supplier of customized universal joints, leverages advanced equipment, craftsmanship, and high-quality materials and specializes in the production of needle rollers, cylindrical rollers, dowel pins, and universal joints.
Offering customization services, we have developed thousands of customized products for our clients over the years. We regularly upgrade our production equipment and processes to meet the evolving needs of our customers, fostering mutual growth. Welcome to contact us for more information!









