Need Help Eliminating Rotational Noise
Thread Starter
Burning Brakes
Joined: Jan 2001
Posts: 1,218
Likes: 2
From: Plainfield IL
Need Help Eliminating Rotational Noise
My '81 has a rotational noise in the rear end. I only hear the noise when decelerating. I thought the problem might be bad U-joints, so I replaced all six (half shafts and drive shaft). What's more, I recently changed the fluid in my differential, so I know it's topped off. None of these steps eliminated the rotational noise.
The noise goes away when the brake pedal is applied. This leads me to believe I might have a warped rotor. I inspected both rotors are they look fine. Also, both calipers are properly torqued. If my trailing arm bearings are bad, wouldn't I hear the rotational noise at all times?
Please let me know your thoughts. I searched the topic on the forum, but very little has been discussed on the topic.
The noise goes away when the brake pedal is applied. This leads me to believe I might have a warped rotor. I inspected both rotors are they look fine. Also, both calipers are properly torqued. If my trailing arm bearings are bad, wouldn't I hear the rotational noise at all times?
Please let me know your thoughts. I searched the topic on the forum, but very little has been discussed on the topic.
Burning Brakes
Joined: Sep 2001
Posts: 1,166
Likes: 0
From: Tulsa Ok
Slop in the front yoke of the Diff will cause a noise on deceleration that dissappears under acceleration. You might drop the driveshaft and check for movement there. Looks like you've eliminated most of the other sources.
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
I actually had a bad set of gears that made mine whine. It was only while coasting. Any acceleration light or hard it was not there. When I got it apart I could not get a good pattern on the coast side of the ring gear. I went round and round with this and finally put in a new set of gears. They had a good pattern after setting them up and now all is quiet again. This was a used rear and I drove them noisy for about 3 years before finally replacing them.
Thread Starter
Burning Brakes
Joined: Jan 2001
Posts: 1,218
Likes: 2
From: Plainfield IL
Originally Posted by theandies
A thump from the rear sound like the front diff. mount bushing. I'd check that.
Team Owner
Joined: Jun 2001
Posts: 23,375
Likes: 1,067
From: Virginia USA
Originally Posted by Biker
Is this the same as a diff. carrier bushing? Is it difficult to replace?
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Drifting
Joined: Aug 2004
Posts: 1,327
Likes: 5
From: 2010 C6 Grand Sport Convertible
Originally Posted by Biker
My '81 has a rotational noise in the rear end. I only hear the noise when decelerating. I thought the problem might be bad U-joints, so I replaced all six (half shafts and drive shaft). What's more, I recently changed the fluid in my differential, so I know it's topped off. None of these steps eliminated the rotational noise.
The noise goes away when the brake pedal is applied. This leads me to believe I might have a warped rotor. I inspected both rotors are they look fine. Also, both calipers are properly torqued. If my trailing arm bearings are bad, wouldn't I hear the rotational noise at all times?
Please let me know your thoughts. I searched the topic on the forum, but very little has been discussed on the topic.
The noise goes away when the brake pedal is applied. This leads me to believe I might have a warped rotor. I inspected both rotors are they look fine. Also, both calipers are properly torqued. If my trailing arm bearings are bad, wouldn't I hear the rotational noise at all times?
Please let me know your thoughts. I searched the topic on the forum, but very little has been discussed on the topic.
Let me know what you find, OK?
Mike
Thread Starter
Burning Brakes
Joined: Jan 2001
Posts: 1,218
Likes: 2
From: Plainfield IL
Someone told me the noise I hear might be the rear brake pads moving laterally in the calipers. They advised me to apply a small amount of graphite to the two pins that secure the pads in each caliper. Is this a good practice? If not, are there any alternatives?
Thread Starter
Burning Brakes
Joined: Jan 2001
Posts: 1,218
Likes: 2
From: Plainfield IL
Seems like we've stumped the forum with this one. Perhaps the rotational noise was an option on certain year C3's. Just kidding, of course.
My '81 has been in my family since purchased new. It has only 34k miles and has never seen winter. The rotational noise started at approx. 33k miles.
My '81 has been in my family since purchased new. It has only 34k miles and has never seen winter. The rotational noise started at approx. 33k miles.
Last edited by Biker; May 19, 2005 at 10:54 AM.
Melting Slicks
Joined: Dec 2004
Posts: 2,101
Likes: 3
From: Cruising somewhere in St. Louis, Missouri
my brake pads for the parking brake was causing symptoms that you are describing. Also might want to check your wheel bearings, jack the wheels up and see if there is play?
Jim
Jim
Navigator
Joined: Aug 2004
Posts: 9
Likes: 0
From: Campobello Island New Brunswick
I have the same noise as thevetteman,acceleration and deceleration.I don't see an answer to his question,so I thought I would ask again.This noise is only there when the strain is on it.Any ideas as to what is wrong?