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07-24-2012, 06:18 PM
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#1 |
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Registered User
Join Date: May 2012
Location: Fontana California
Posts: 97
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Need Help - Grinding Noise After Rear Diff Fluid Change
Okay Gents,
I am in the process of installing my flip kit and C-Notch and my bed is off. I figured this was the time to freshin things up, so I changed the oil in the diff. I took the cover off and replaced the gasket on my 10 bolt rear end, and now I hear an occasionaly grinding. I put synthetic lucus gear oil in it. Has anybody ran into this issue. I was backing out of my drive way when I heard it. It sounds like a osilating grind every 10 revolutions or so. I may take it appart to inspect. but, I wanted to see if anybody has experienced this issue. I appreciate any advice you guys can give me. I don't want to damage anything. Thank you. |
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07-24-2012, 06:28 PM
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#2 |
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Registered User
Join Date: Nov 2010
Location: Windsor Locks
Posts: 628
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Re: Need Help - Grinding Noise After Rear Diff Fluid Change
do you have a posi or limited slip ?
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07-24-2012, 06:53 PM
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#3 |
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Registered User
Join Date: May 2012
Location: Fontana California
Posts: 97
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Re: Need Help - Grinding Noise After Rear Diff Fluid Change
Bone stock 3:08 gears. Liminted slip
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07-24-2012, 09:13 PM
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#4 |
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Registered User
Join Date: Mar 2012
Location: Woodbury, Ct.
Posts: 1,673
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Re: Need Help - Grinding Noise After Rear Diff Fluid Change
If its limited slip you are supposed to add the additive..Some units don't like synthetic oil.
I think auburn for example says not to use it. Posted via Mobile Device |
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07-24-2012, 09:41 PM
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#5 |
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18 Till I Die
Join Date: Mar 2005
Location: Alberta, Canada
Posts: 1,522
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Re: Need Help - Grinding Noise After Rear Diff Fluid Change
Yup its the Chatter of the Clutches
__________________
2011 GMC Acadia 1969 GMC BBC LS7 2007 GMC Crew Duramax 1987 Camaro Iroc 350 Tuned Port Injection 42000Km 1987 Chevrolet Silverado 350 TBI 1987 Chevrolet Silverado 350 TBI(yes 2) Take me drunk, I'm too home... 
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07-24-2012, 10:41 PM
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#6 |
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Salty Sailor
Join Date: May 2009
Location: Savannah, Ga
Posts: 603
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Re: Need Help - Grinding Noise After Rear Diff Fluid Change
with a posi, my understanding is that it is better to use conventional gear oil with posi-additive.
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86 c-10 Custom Deluxe Savannah, Georgia |
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07-25-2012, 10:57 AM
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#7 |
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Registered User
Join Date: May 2012
Location: Fontana California
Posts: 97
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Re: Need Help - Grinding Noise After Rear Diff Fluid Change
It kind of sounds like it's scraping the cover, but there is only one way to install the cover. I changed the fluid out on my 81 and never ran into this problem. Do you guys think I should pull the cover off and add a none synthetic gear oil? It will set me back another 30 bucks, but if that's the problem, then I don't feel too bad spending the coin. The truck is bone stock with the original differential. I have 103k miles. All was fine until I changed the fluid. Let me know what you guys think. Thanks for your help.
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07-25-2012, 11:04 AM
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#8 |
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Happy to be here
 
Join Date: Mar 2000
Location: Cypress, TX
Posts: 39,023
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Re: Need Help - Grinding Noise After Rear Diff Fluid Change
I would add the additive first and see if that eliminates the slip.
__________________
Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra" |
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07-25-2012, 11:08 AM
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#9 |
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Registered User
Join Date: May 2012
Location: Fontana California
Posts: 97
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Re: Need Help - Grinding Noise After Rear Diff Fluid Change
What kind of additive do you recommend? Also, the diff is filled level with the plug, should I try to pull some oil out?
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07-25-2012, 12:37 PM
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#10 |
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Senior Member
Join Date: May 2004
Location: Caldwell,Tx.
Posts: 3,648
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Re: Need Help - Grinding Noise After Rear Diff Fluid Change
Go to the auto parts store and ask for a bottle of posi lube additive. Its a small bottle . Maybe 4 ounces . I would just park it on a slight incline so that the passenger side is higher and add the lube to the oil you have in it . I just had to do the same on my 65 chevelle. It had a clutch type posi and the previous owner did not add the lube . It growled when I turned sharply at low speeds . It was quiet after the lube .
Frank
__________________
Born and proudly residing in a Red State ! |
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07-26-2012, 03:09 PM
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#11 |
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Registered User
Join Date: May 2012
Location: Fontana California
Posts: 97
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Re: Need Help - Grinding Noise After Rear Diff Fluid Change
Found my problem guys. I jacked up the rear of my truck and placed it on 4 jack stands to install my c notch. I was able to spin the wheels and better listen for the grinding. It turns out that the noise was comming from my wheel. I though mabe a part of the brake pad came off and was rubbing. I pulled the wheel and drum off and it turns out that I had a piece of the broken riviet stuck between the drum and backing plate causing the grinding. The piece of rivet came from my bump stops that I removed from the frame for the notch.
Anyways- Thank you guys for your help. I just thought I would share that with you. BLUE SQUARE |
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