knocking sound from rear diff
Thread Starter
Cruising
Joined: Jan 2009
Posts: 11
Likes: 0
knocking sound from rear diff
Hi everyone,
In my 77 vette, after about 20 minutes drive, usualy while turning or braking, I get a knocking sound from the rear left inner wheel side.
Two friends of mine, who own a C3 vette as well told me they have the same noise and they think that its from the wheel lockers (I think that's the right term) to the diff.
1. does anyone familiar with that?
2. if they are correct, are there any parts I need to fix it?
Hope someone can assist me
A.L.
In my 77 vette, after about 20 minutes drive, usualy while turning or braking, I get a knocking sound from the rear left inner wheel side.
Two friends of mine, who own a C3 vette as well told me they have the same noise and they think that its from the wheel lockers (I think that's the right term) to the diff.
1. does anyone familiar with that?
2. if they are correct, are there any parts I need to fix it?
Hope someone can assist me
A.L.
Thread Starter
Cruising
Joined: Jan 2009
Posts: 11
Likes: 0
Thanks Roger.
Forgive my English since it's not my native tongue.
I've filled the rear axle with Motorcraft SAE 80W-90 API SERVICE GL-5 (same spesifications as in the owners manual) and it didn't help.
If U think I did wrong, Can you elaborate what exact products should I use?
A.L.
Forgive my English since it's not my native tongue.
I've filled the rear axle with Motorcraft SAE 80W-90 API SERVICE GL-5 (same spesifications as in the owners manual) and it didn't help.
If U think I did wrong, Can you elaborate what exact products should I use?
A.L.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
You should have put this additive in also. I put 2 bottles in and then fill.
http://www.ecklers.com/positraction-...-additive.html
http://www.ecklers.com/positraction-...-additive.html
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
You need the additive in the above post by Roger along with the rear end oil you already put in.
Then go to a parking lot and do a bunch of figure 8's, tight left and right hand turns and the noise should go away
Use two bottles, you know us North Americans, if one works two should work twice as good
Seriously they say 1 bottle or 4 ounces but most put in 2 bottles or 8 ounces
Then go to a parking lot and do a bunch of figure 8's, tight left and right hand turns and the noise should go away
Use two bottles, you know us North Americans, if one works two should work twice as good
Seriously they say 1 bottle or 4 ounces but most put in 2 bottles or 8 ounces
Thread Starter
Cruising
Joined: Jan 2009
Posts: 11
Likes: 0
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Thread Starter
Cruising
Joined: Jan 2009
Posts: 11
Likes: 0
Thank you very much for your help.
I also found what you showed for 10$:
http://corvettepartsman.com/1963-96l...ential4oz.aspx
I also found what you showed for 10$:
http://corvettepartsman.com/1963-96l...ential4oz.aspx
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Racer
Joined: Aug 2006
Posts: 359
Likes: 0
From: PYOTE BOMBER BASE TEXAS
You just might check all of your U-Joints while you are under there...if you have not done so...the Grease Zerks are easy to over look when servicing...and can get good and rusty inside the needle bearings...they make a noise when dry... Good Luck!
Last edited by TEXASDESERTVETTE; Jun 26, 2010 at 05:48 PM.
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Thank you very much for your help.
I also found what you showed for 10$:
http://corvettepartsman.com/1963-96l...ential4oz.aspx
I also found what you showed for 10$:
http://corvettepartsman.com/1963-96l...ential4oz.aspx
Thread Starter
Cruising
Joined: Jan 2009
Posts: 11
Likes: 0
Thank you all for your replies.
Since they can not airborne it, I have a Motorcraft dealer that can sell me a "Motorcraft rear axle additive friction modifier XL-3 (4 oz. bottle)"
Can anyone tell me if I can use that?
As shown here:
http://i2.frsimg.com/FR-Motorcraft-X...il_p_2288.html
Specifications according to Motorcraft: "EST-M2C118-A".
Thanks.
A.L.
Since they can not airborne it, I have a Motorcraft dealer that can sell me a "Motorcraft rear axle additive friction modifier XL-3 (4 oz. bottle)"
Can anyone tell me if I can use that?
As shown here:
http://i2.frsimg.com/FR-Motorcraft-X...il_p_2288.html
Specifications according to Motorcraft: "EST-M2C118-A".
Thanks.
A.L.
Melting Slicks
Joined: Apr 2001
Posts: 2,030
Likes: 363
From: Lubbock Texas
Thank you all for your replies.
Since they can not airborne it, I have a Motorcraft dealer that can sell me a "Motorcraft rear axle additive friction modifier XL-3 (4 oz. bottle)"
Can anyone tell me if I can use that?
As shown here:
http://i2.frsimg.com/FR-Motorcraft-X...il_p_2288.html
Specifications according to Motorcraft: "EST-M2C118-A".
Thanks.
A.L.
Since they can not airborne it, I have a Motorcraft dealer that can sell me a "Motorcraft rear axle additive friction modifier XL-3 (4 oz. bottle)"
Can anyone tell me if I can use that?
As shown here:
http://i2.frsimg.com/FR-Motorcraft-X...il_p_2288.html
Specifications according to Motorcraft: "EST-M2C118-A".
Thanks.
A.L.
This is what I used last time I serviced my '73: http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Trans-X&174;-Posi-Trac&174;-Limited-Slip-Gear-Oil-Additive-K-&-W-Chemical_7070977-P_N3242_T|GRP2035____
It worked fine for me.
DC
