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Re: bad driveshaft on V8?

In a message dated 6/22/98 12:42:48 PM Eastern Daylight Time,
jdhillon@cibc.onramp.ca writes:

> I get a thump in the back when my tranny shifts occasionally on my V8..
>  could this be due to a bad u-joint on my driveshaft? I reached under my car
>  and turned the shaft back and forth by hand.. there seems to be some play
>  before the gears start turning on each end. Any place else I should check
>  before digging into removing the exhaust and driveshaft for a looksee?? 
>  How can one diagnose a bad CV joint? I get some vibration at highway
>  speeds. 
>  Also, when I drive over a speedbump, I feel a bumping noise as if something
>  is not quite tight. Any ideas on what might be the cause - it feels like it
>  is in the front end somewhere but I have checked wheel bearings and tie rod
>  ends. All seems ok.

I'd check for a loose/broken mounting bolt at the front of the REAR diff.
This happened to me years back, and it was just as you describe -- hit
anything before it started making this noise?