How are universal joint issues diagnosed?
When a U-joint is making noise, the entire driveline must be inspected to determine the noisy joint. The noisy universal joint will feel loose compared to the others, and may even have visible movement. The transmission or transfer case seal nearest the U-joint may also be leaking, and the carrier bearing, if equipped, may be worn.

How is a universal joint replaced?
The faulty universal joint is replaced as an individual component, or by replacing the entire drive shaft. Vehicles with non-serviceable universal joints will require driveshaft replacement. Serviceable u-joints require removing retaining clips, and sliding one side of the joint out of the yokes at a time. The new universal joint slips in, and is help by retaining clips. If the transmission of transfer case seal requires replacement, the drive shaft is easily removed, and installed.
RepairPal Recommendations for universal joint issues
We recommend using OEM quality or better when selecting universal joints. These parts tend to be inexpensive, and are vital to the smooth operation of your vehicle. Purchasing low quality universal joints may lead to repeating this repair.
What to look out for when dealing with universal joint issues
If the universal joint binds and breaks, when it falls from the transmission, transmission fluid will be lost quickly from the tail shaft, and the engine will rev higher than expected. This can result in transmission damage, and can be prevented by repairing the issue soon after it is noticed.
Can I replace the universal joint myself?
Universal joint replacement can be accomplished with a few tools, and a little mechanical experience. If removal and installation procedures of a universal joint are not followed strictly, damage to the needle bearings may lead to failure. If the U-joint requires replacement of the entire drive shaft, a professional service may be able to replace only the universal joint to save parts costs.