U-Joint Replacement
What is a universal joint?
A universal joint is a joint that is bolted or welded onto a shaft, and allows that shaft to rotate, even when bending. In rear wheel drive and four-wheel drive vehicles, they allow the suspension to travel without breaking the drive shaft.
How does the universal joint work?
By attaching a four-way hinge between two shafts, the two shafts can move independently of one another, in all directions, and the power from one of the shaft can be transferred to the other end of the shaft, even while the shaft is bent. This allows the drive shaft, and some axles, to connect two components that are not in fixed positions relative to each other.
A defective U joint will cause a vibration that can be felt throughout the vehicle. This may be especially bad during acceleration.
What are the symptoms related to a bad universal joint?
Commonly, vibrations that increase with vehicle speed, and a rapid chirping noise are very evident when a universal joint (U-joint) fails. The chirping and vibration may change intensity as the vehicle passes over bumps in the road. As the problem progresses, the drive shaft may make a loud clunk anytime the vehicle is put into reverse or drive. Vibrations, and wobbling will eventually lead to leaky seals on the transmission tail shaft, or transfer case. When the U-joint has reached total failure, it may bind and break, which can allow the drive shaft to fall off the vehicle while driving.
Can I drive with a universal joint problem?
It is not recommended to drive with a failing universal joint. Every time the universal joint squeaks, is a chance it can bind and break. If driving the vehicle must be done, slow speeds and light acceleration are recommended. The universal joint should not be left unattended and in operation for any extended period of time, as failure will occur, and damage to the vehicle is possible.