Skip the auto shop - Our mechanics make house calls

Q: U-joint vibration

asked by on

I've changed the u joint on the rear axle a few months back. Should have changed them all, but I didn't. It's a 4x4. I'm thinking the other joints are going bad as well as there is some excessive vibrations. Worse with higher speeds or highway speeds. When I'm driving and I tap the breaks and let it coast, the vibration stops until I accelerate again. Is that as well indicative for the driveshaft being out of balance because of the i joints? Or another issue. I was thinking about replacing all the joints and the carrier bearing.

My car has 235435 miles.
My car has an automatic transmission.

Worn U-joints installed on a well balanced driveshaft will cause vibration and noise as the whole assembly slaps around while rotating at high speed. However, the cause of the changing amount of vibration during coasting versus acceleration can only be evaluated once it is certain that the U-joints are all in good shape and properly installed. For example, if vibration continues even with new u joints all around, there could be a driveshaft alignment issue and, of course, the cause of the vibration could be elsewhere in quite a few other components. It is fairly easy to evaluate the condition of the remaining u-joints and so checking the ones you did not replace is the first thing to do. You should consider the condition of the front axles as well, whether CV joints or u-joints. If you desire that a certified specialist from YourMechanic perform a U-joint diagnostic and make repair recommendations.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Fuel economy

It is best to abide by the recommendations stated in the owners manual. Turning off traction control may allow more stress to be put on the vehicle and cause accelerated wear in some areas. The traction control is not directly...

Q: Vehicle shudders when starting and stopping. Runs fine at cruising speed

You may have a problem with the transmission's lower gears. There may be a shifting issue causing it to slip in lower gears. Problems like these can be hard to pinpoint if not seen in person. Have a certified mechanic,...

Q: Will crank won't start

Hi there. Based on your feedback, it appears that your ignition system components are functioning good. I would be concerned about the reduced amps on 1,2,3 and 6; but if I had to guess, I would start with inspecting fuel...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...