Rear diff started clunking
Thread Starter
Instructor
Joined: Jun 2007
Posts: 160
Likes: 1
From: Pembroke Pines Florida
Rear diff started clunking
OK, I've read about it here, and now, after about 7,000 miles, I've started hearing a clunking sound in my 08's differential, especially in the morning, backing out of the garage.
I know there's a TSB on this, but my question is this -- how quickly do I need to get to the dealership? Is there a danger of permanent damage, or is this mostly an annoyance.
I know there's a TSB on this, but my question is this -- how quickly do I need to get to the dealership? Is there a danger of permanent damage, or is this mostly an annoyance.
Safety Car
Joined: Oct 2007
Posts: 4,269
Likes: 4
From: Mililani HI
The rearend needs an additional bottle of additive. The TSB calls for new gear lube and now two bottles of 4 oz additive. I did a quick fix as this is the 2nd time my rearend started clunking. I added 1 4oz bottle of Amsoil additive and did some slow figure 8's and the clunking has stopped.
Anytime there is gears making noise such as the clunking and grinding the longer you wait the more the gears are damaged.
Anytime there is gears making noise such as the clunking and grinding the longer you wait the more the gears are damaged.
Safety Car
Joined: Apr 2006
Posts: 4,254
Likes: 5
From: Anaheim Hills, Ca
The rearend needs an additional bottle of additive. The TSB calls for new gear lube and now two bottles of 4 oz additive. I did a quick fix as this is the 2nd time my rearend started clunking. I added 1 4oz bottle of Amsoil additive and did some slow figure 8's and the clunking has stopped.
Anytime there is gears making noise such as the clunking and grinding the longer you wait the more the gears are damaged.
Anytime there is gears making noise such as the clunking and grinding the longer you wait the more the gears are damaged.
PHOTOSHOP SPECIALIST
Joined: Aug 2007
Posts: 16,433
Likes: 40
St. Jude Donor '07-'08-'09-'10-'11-'12-'13-'14-'15-'16
There is an updated TSB on this condition that utilizes the new DEXRON® LS gear oil, P/N 88862624.
Check it out:
http://forums.corvetteforum.com/1568036286-post3.html
Last edited by *FAÇADE*; Dec 4, 2008 at 09:27 AM.
Racer
Joined: Mar 2007
Posts: 255
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From: ELLWOOD CITY PA
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Pro
Joined: Jul 2007
Posts: 501
Likes: 4
From: Deep in the Heart of Texas
Just had mine done today...
and it's made a huge improvement. Not only did it get rid of the clunks when backing out of the driveway, but also turning noises that I had not associated with the differential have gone away (and I hope they stay away).
Drifting
Joined: Oct 2007
Posts: 1,565
Likes: 2
From: The Great Pacific Northwest...........I carry a gun cause a cops too heavy.
Melting Slicks
Joined: Dec 2004
Posts: 2,009
Likes: 37
From: Laurel Maryland
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13
About a year ago, my Corvette tech changed the fluid and the clunking went away. That was the good news. The bad news is that it is clunking worse than ever now, back to the shop, they will make it right. Don't tell me that the GMPP is not necessary on these cars. Last time in they saw that I had the GMPP and the tech's response was good on ya. Who knows better than this guy??--Ed
Melting Slicks
Joined: Sep 2004
Posts: 3,488
Likes: 27
From: Long Island NY
We need some sort of "sticky" or whatever... I want to know if and when anyone who has correctly swapped in the new Dextron LS experiences chatter again.
The Dextron LS is still pretty new... have not yet heard of any reports of chatter after using the Dextron LS. Perhaps the Dextron LS is THE end-all fix. So far it seems very promising. I just ordered some and will be swapping into my differential soon.
For those who want to be safe, you probably can't go wrong just swapping in the Dextron LS right now. I just ordered 3 one-quart bottles from Gene Culley (differential takes about 2 quarts)... was about $46 plus shipping... will swap it myself... easy. It's cheap insurance and keeps your car out of the dealership where often you will get it back in worse shape than when you brought it in.
The Dextron LS is still pretty new... have not yet heard of any reports of chatter after using the Dextron LS. Perhaps the Dextron LS is THE end-all fix. So far it seems very promising. I just ordered some and will be swapping into my differential soon.
For those who want to be safe, you probably can't go wrong just swapping in the Dextron LS right now. I just ordered 3 one-quart bottles from Gene Culley (differential takes about 2 quarts)... was about $46 plus shipping... will swap it myself... easy. It's cheap insurance and keeps your car out of the dealership where often you will get it back in worse shape than when you brought it in.
Safety Car
Joined: Feb 2007
Posts: 4,942
Likes: 4
From: LINCOLN RI - 2010 GS Coupe - 2007 Coupe
We need some sort of "sticky" or whatever... I want to know if and when anyone who has correctly swapped in the new Dextron LS experiences chatter again.
The Dextron LS is still pretty new... have not yet heard of any reports of chatter after using the Dextron LS. Perhaps the Dextron LS is THE end-all fix. So far it seems very promising. I just ordered some and will be swapping into my differential soon.
For those who want to be safe, you probably can't go wrong just swapping in the Dextron LS right now. I just ordered 3 one-quart bottles from Gene Culley (differential takes about 2 quarts)... was about $46 plus shipping... will swap it myself... easy. It's cheap insurance and keeps your car out of the dealership where often you will get it back in worse shape than when you brought it in.
The Dextron LS is still pretty new... have not yet heard of any reports of chatter after using the Dextron LS. Perhaps the Dextron LS is THE end-all fix. So far it seems very promising. I just ordered some and will be swapping into my differential soon.
For those who want to be safe, you probably can't go wrong just swapping in the Dextron LS right now. I just ordered 3 one-quart bottles from Gene Culley (differential takes about 2 quarts)... was about $46 plus shipping... will swap it myself... easy. It's cheap insurance and keeps your car out of the dealership where often you will get it back in worse shape than when you brought it in.
Anytime I can keep my Vette out of the dealership it's a definite plus.
Le Mans Master
Joined: Aug 2005
Posts: 6,709
Likes: 1
From: Pacific Northwest
St. Jude Donor '06
So far about 6,000 miles and no noise. I did a bunch of slow figure eights...both forward and backward. I'm sure my neighbors thought I was going nuts (or just continuing to be nuts)!
dealer. No more noise.
Banned Scam/Spammer
Joined: Aug 2005
Posts: 15,607
Likes: 3
From: 41-33 Cry it out Koko!!!
St. Jude Donor '08-'09-'10-'11
First, I have the clunking in my 05.
Now, if I take it into the dealer and they do their magic with a fluid change... How do we know that there isn't any permanent damage inside the diff from it clunking to begin with and that it will resurface later out of warranty?
Would we be better served if we let the clunking run its course and it restricts or locks up the diff. and we get all new guts?
Now, if I take it into the dealer and they do their magic with a fluid change... How do we know that there isn't any permanent damage inside the diff from it clunking to begin with and that it will resurface later out of warranty?
Would we be better served if we let the clunking run its course and it restricts or locks up the diff. and we get all new guts?