rear end grinding continues
Thread Starter
Pro
Joined: Oct 2003
Posts: 705
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From: Churchville MD
rear end grinding continues
well I tried the amsoil 75w-90 extreme duty gear oil in the noisy rear and it actually made the grinding worst. The instructions claim the friction modifier is already added but I question that. Quess it goes to the dealer tomorrow. I should have kept my c5.
Last edited by 02impactblue; Jul 11, 2006 at 09:23 PM.
Burning Brakes
Joined: Mar 2006
Posts: 752
Likes: 0
From: dallas tx
i drop my off for the grinding noise this morning. They called me and said they couldnt hear it.
A whole bunch of dumb a** in that service dept.
Without telling my buddy at work...i drove in and out of the parking lot...and they notice the grinding sound.
Any advice...
A whole bunch of dumb a** in that service dept.
Without telling my buddy at work...i drove in and out of the parking lot...and they notice the grinding sound.
Any advice...
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
Originally Posted by wratran
i drop my off for the grinding noise this morning. They called me and said they couldnt hear it.
A whole bunch of dumb a** in that service dept.
Without telling my buddy at work...i drove in and out of the parking lot...and they notice the grinding sound.
Any advice...
A whole bunch of dumb a** in that service dept.
Without telling my buddy at work...i drove in and out of the parking lot...and they notice the grinding sound.
Any advice...
Ranger
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Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Originally Posted by 02impactblue
well I tried the amsoil 75w-90 extreme duty gear oil in the noisy rear and it actually made the grinding worst. The instructions claim the friction modifier is already added but I question that. Quess it goes to the dealer tomorrow. I should have kept my c5.
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C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
Thread Starter
Pro
Joined: Oct 2003
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From: Churchville MD
Originally Posted by Subdriver
Sorry to hear about your continued diff problems. But I will confirm that the AMSOIL Severe Gear 75w90 does come with friction modifier pre-mixed in. Been using that fluid in my C5 Z06 for years without additional modifier with no diff chatter.
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Originally Posted by 02impactblue
I added 4oz of the GM friction modifier and the noise is gone. Maybe the amsoil has some in it but in my case it wasn't enough. I'm also not nieve enough to believe this is the permanent fix. A car that was perfectly quiet until 2 days ago 4800 miles and replacing the synthetic gear oil and additive fixes it doesn't sound right. Maybe the friction modifier doesn't perform well with synthetic oils overtime.
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Thread Starter
Pro
Joined: Oct 2003
Posts: 705
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From: Churchville MD
Originally Posted by Subdriver
I don't think that is it. I've been following all the C6 diff threads with interest as I'm considering buying one for my new daily driver. I am getting the impression that the C6 diff clutch packs just perform differently than those in the C5 and that they may need more friction modifier than those in the C5. Maybe they use different material?
Racer
Joined: May 2006
Posts: 402
Likes: 3
Here is the bulletin #pip3559, fluid replacement first, but many times the clutch packs will need to be replaced also. The noise can come and go, may not be there all the time. This bulletin is in the preliminary bulletin section of S.I.(service information). This is NOT uncommon for Vettes to do, but they should be able to take care of it for you
Le Mans Master
Joined: Nov 1999
Posts: 7,695
Likes: 51
From: Imperial Beach CA
Originally Posted by Chevtech
Here is the bulletin #pip3559, fluid replacement first, but many times the clutch packs will need to be replaced also. The noise can come and go, may not be there all the time. This bulletin is in the preliminary bulletin section of S.I.(service information). This is NOT uncommon for Vettes to do, but they should be able to take care of it for you
Happened to me, changed fluid first and then the clutch packs been fine ever since, that was 30K miles ago. The bulletin gives the procedure.