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Noise from rear!

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Old Jun 3, 2007 | 10:26 PM
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Default Noise from rear!

I hear this grinding, scraping sound when I am going very slow & am making a sharp turn, Left or right, from the back wheel area. I know at this point my back wheels are not turning at equal rates. Last summer here in Vegas, my rear end would leak a little after a long drive in the extreme heat. This did not happen too many times & I dont think I lost that much fluid, but now I'm not so sure. I am thinking maybe I am hearing the clutches in the rear end.

I did go to chevy for the leak, but after 3 times they never could duplicate the leak, lucky me Now my extended warrenty is gone. I guess I need to check the fluid level & see from there. Any suggestions!!

Thanks!

Rob
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Old Jun 3, 2007 | 10:38 PM
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To a certain point, the noises you hear are very normal. I had the typical differential chatter until I changed the diff. fluid to Amsoil SVG; the noise almost disappeared. Check the fluid level to make sure that you didn't lose a significant amount of fluid.
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Old Jun 3, 2007 | 11:02 PM
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Originally Posted by allmee
I hear this grinding, scraping sound when I am going very slow & am making a sharp turn, Left or right, from the back wheel area. I know at this point my back wheels are not turning at equal rates. Last summer here in Vegas, my rear end would leak a little after a long drive in the extreme heat. This did not happen too many times & I dont think I lost that much fluid, but now I'm not so sure. I am thinking maybe I am hearing the clutches in the rear end.

I did go to chevy for the leak, but after 3 times they never could duplicate the leak, lucky me Now my extended warrenty is gone. I guess I need to check the fluid level & see from there. Any suggestions!!

Thanks!

Rob
Sounds like you are low on diff fluid or you need to add limited slip additive as the big symptom is chatter on sharp turns. id check the level asap. rear should be quiet at all times.

If you drain and fill with Amsoil Severe Gear, you dont need any additives.
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Old Jun 3, 2007 | 11:04 PM
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Thanks guys! I appreciate the info!!
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Old Jun 3, 2007 | 11:20 PM
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One other quick Q............do I check the level hot or cold. I saw this topic a while back but have forgotten!
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Old Jun 4, 2007 | 12:08 AM
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Originally Posted by allmee
One other quick Q............do I check the level hot or cold. I saw this topic a while back but have forgotten!
I normally check my diff level when cold since it is a little impractical to get the fill plug off when the diff is hot without burning yourself.
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Old Jun 4, 2007 | 12:55 AM
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Originally Posted by Subdriver
I normally check my diff level when cold since it is a little impractical to get the fill plug off when the diff is hot without burning yourself.
Sounds good !

Grazie!
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Old Jun 4, 2007 | 12:56 AM
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Changing the fluid and putting the additive in is the surely the fix. After the change, do a couple of very SLOW figure-eights in forward and reverse to work it into the synchros. It stopped the grinding/clicking sounds from my diff.
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Old Jun 4, 2007 | 10:22 AM
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Originally Posted by Ikester
Sounds like you are low on diff fluid or you need to add limited slip additive as the big symptom is chatter on sharp turns. id check the level asap. rear should be quiet at all times.

If you drain and fill with Amsoil Severe Gear, you dont need any additives.
Is anyone running this Amsoil severe gear? I may want to do that to avoid using the 2 fluids & measuring! What weight would I need?

Last edited by allmee; Jun 4, 2007 at 10:24 AM.
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Old Jun 4, 2007 | 11:22 AM
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I have the Amsoil SVG in my differential. You will need 75W90 if I recall correctly.
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Old Jun 4, 2007 | 01:30 PM
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Originally Posted by YeloFevr
I have the Amsoil SVG in my differential. You will need 75W90 if I recall correctly.
Just ordered some!! You guys ROCK!!!
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Old Jun 4, 2007 | 05:23 PM
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Originally Posted by allmee
Just ordered some!! You guys ROCK!!!

Same here..... Amsoil Severe Gear 75W-90. Did several slow & tight figure 8's and all is good.

Don't be surprised if you can't find Amsoil in the stores - cuz its not sold in most auto stores.

Search their website and locate a *dealer* in your area. A dealer doesn't have to be a 'business' but could be the neighbor who lives down the street.

http://www.amsoil.com/

Good Luck!
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Old Jun 4, 2007 | 10:49 PM
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Originally Posted by Janster
Same here..... Amsoil Severe Gear 75W-90. Did several slow & tight figure 8's and all is good.

Don't be surprised if you can't find Amsoil in the stores - cuz its not sold in most auto stores.

Search their website and locate a *dealer* in your area. A dealer doesn't have to be a 'business' but could be the neighbor who lives down the street.

Good Luck!
Or order online direct from AMSOIL (info in my sig or use the link to the left), use reference #1206638 and the sale benefits my dealership and the forum.
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