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Topic: Rear Noise

in Forum: C4 Driveline Components

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Re: Rear Noise

Posted: 10/15/11 7:58am Message 11 of 13
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RitaJean
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Mesa, AZ - USA
Joined: 4/26/2011
Posts: 64
Vette(s): 1995 Coupe Red, automatic, all original, haven't changed a thing -- except the tires, battery, stuff like that. You know what I mean!

(Mentioned driving the same road where I first heard the rear noise, didn't mean that was the only road I heard the noise on.  I'm hearing the noise no matter where I'm driving, whenever I get up to 75 or faster.  Sorry for being kinda misleading.)

Got my tires checked out, no signs of unusual wear, separating, etc.; balance was a little off.  Took same way to work as before, ran it up to 75 - where I heard the noise.  Still hear some noise but not as loud.  Took different road home (had to pass usual off ramp in order to find a stretch where I could safely reach 75 and up!) still some noise. 

Should my next step in fixing this be getting an alignment?  Or should I just jump into the u-joints, bearings, etc. 




Love my C4!

 

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Re: Rear Noise

Posted: 10/15/11 7:56pm Message 12 of 13
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urbie4
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Providence, RI - USA
Joined: 9/27/2011
Posts: 21
Vette(s): Red 1996 targa top, all stock as far as I know.
>> Mesa, AZ <<

Ah, I used to live in AZ (Flagstaff), before moving back east to RI -- and a Vette would have been a much better car for out there than back here!  Aside from the party-pooper 65mph speed limit, we don't have the long stretches of open-road-with-no-hiding-places-for-cops, for top speed runs.  My favorite stretch used to be on Route 87 south of Winslow -- a nice long straight where you could really air it out!

Urb




Re: Rear Noise

Posted: 10/27/11 7:50am Message 13 of 13
FLDAVE
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Joined: 11/22/2009
Posts: 60
Vette(s): 1953 1992 BLACK ON BLACK
Rita:
Here's some old school stuff that still seems to apply today:
 
If you have a "clunk" noise during a jack rabbit start or suddenly taking your foot off the go pedal at speed, it's usually a drive shaft U-Joint.  Of course, replace both.
 
If you have a "clunk" during tight turns, it's usually indicative of a half-shaft U-Joint. Replace all four. 
 
Constant hum or whine is usually a wheel bearing. And they usually hum in a sine wave. A slight up and down sound. And it will get worse with time. They don't catastrophically fail, so just keep an "ear" on it.
 
As always go after the easy, cheap stuff first. Like changing the diff fluid with synthetic and don't forget the special GM Positraction additive.
 

Also, these cars are not Cadillac’s. The don't ride soft, and they're not quite.

Kinda like a low rider pick-up. Or, you could say "They have very positive visceral feed back".
 
Hope this helps, Dave.



in Forum: C4 Driveline Components


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