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View Full Version : What are the steps involved in diagnosing



Beachcomber
05-06-2004, 11:56 AM
a faulty u-joint/cv-joint/driveshaft?

When I select REVERSE, there is a clunk - almost as if there is some slack being taken up in the driveline before things totally engage.

It ONLY happens in reverse - It has NEVER made this noise when selecting a forward gear.

Transmission seems fine - I've had no issues there. There is a VERY slight vibration when I accelerate - gone by the time I reach 15-20 mph, and I suspect it's the center bearing/mount.

I have a flex disc and center bearing/mount ready to go, but I don't want to install these parts if there's a faulty u-joint/cv-joint in the driveshaft, which may ruin the new parts.

The local independent shop told me that it wasn't necessary, nor did he recommend installing a new center bearing/mount while replacing the flex disc. He said if the center bearing/mount is shot, then more than likely the driveshaft's rear u-joint is probably starting to sieze.

What's the difference between a u-joint and a cv-joint, and how do I test each for play/wear/whatever?

btw, the car has about 120,000 miles.

Thanks all!