C6 Differential Chatter
Thread Starter
Instructor
Joined: May 2000
Posts: 208
Likes: 0
From: Mesa, AZ, USA
C6 Differential Chatter
I'm currently Vette-less, but a co-worker has a 2008 and was telling me today at lunch that she hears a weird noise when making tight, slow-speed turns. She took me for a drive and I heard it: Sounds like the very same chatter I used to hear from the differential in my old '01 Coupe. I remember that I got an additive from the dealer, crawled under the back-end of the car and poured it into the drain plug. No more chatter.
Do you think it's the same thing on my friend's C6? I got down and looked for the drain plug, but an aluminum crossmember was in the way and I couldn't see it. If this is the same problem I had years ago, with the same fix, how hard is it to get at the drain plug?
Do you think it's the same thing on my friend's C6? I got down and looked for the drain plug, but an aluminum crossmember was in the way and I couldn't see it. If this is the same problem I had years ago, with the same fix, how hard is it to get at the drain plug?
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Probably needs the new fluid. GM changed to a newer fluid late in '08 that doesn't require a separate friction modifier additive.
Here's the TSB:
http://forums.corvetteforum.com/1564283516-post6.html
And here's a DIY on changing, it's doable but takes a little finesse.
http://forums.corvetteforum.com/c6-c...s-for-faq.html
Here's the TSB:
http://forums.corvetteforum.com/1564283516-post6.html
And here's a DIY on changing, it's doable but takes a little finesse.
http://forums.corvetteforum.com/c6-c...s-for-faq.html
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
I don't off hand. I'll look around and see if I can find any references. If I do I'll post back with an Edit in this post. 
Edit: Ah, found it in a current discussion. See post #15:
http://forums.corvetteforum.com/c6-c...ing-noise.html
Edit: Ah, found it in a current discussion. See post #15:
http://forums.corvetteforum.com/c6-c...ing-noise.html
Last edited by RicK T; Aug 18, 2011 at 05:27 PM.
Team Owner
Joined: Sep 2000
Posts: 25,009
Likes: 2,707
From: Far NW 'burbs of Chicago
St. Jude Donor '13
Probably needs the new fluid. GM changed to a newer fluid late in '08 that doesn't require a separate friction modifier additive.
Here's the TSB:
http://forums.corvetteforum.com/1564283516-post6.html
And here's a DIY on changing, it's doable but takes a little finesse.
http://forums.corvetteforum.com/c6-c...s-for-faq.html
Here's the TSB:
http://forums.corvetteforum.com/1564283516-post6.html
And here's a DIY on changing, it's doable but takes a little finesse.
http://forums.corvetteforum.com/c6-c...s-for-faq.html
As usual, Rick is correct.
Be sure to note the part about not needing any additional additive.
Just pour in the new stuff and go do a few figure-8's in the parking lot.
Supporting Vendor
Joined: Apr 2011
Posts: 3,332
Likes: 195
From: Frederick Maryland
St. Jude Donor '08-'09-'10-'11-'12, '14-'15-'16-'17-'18
I'm currently Vette-less, but a co-worker has a 2008 and was telling me today at lunch that she hears a weird noise when making tight, slow-speed turns. She took me for a drive and I heard it: Sounds like the very same chatter I used to hear from the differential in my old '01 Coupe. I remember that I got an additive from the dealer, crawled under the back-end of the car and poured it into the drain plug. No more chatter.
Do you think it's the same thing on my friend's C6? I got down and looked for the drain plug, but an aluminum crossmember was in the way and I couldn't see it. If this is the same problem I had years ago, with the same fix, how hard is it to get at the drain plug?
Do you think it's the same thing on my friend's C6? I got down and looked for the drain plug, but an aluminum crossmember was in the way and I couldn't see it. If this is the same problem I had years ago, with the same fix, how hard is it to get at the drain plug?
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Race Director
Joined: Sep 2000
Posts: 11,139
Likes: 1,912
From: Missouri City, TX
The new fluid DEXRON LS didn't become factory fill in corvettes until MY2009. Meaning 2008 and older vettes are very susceptive to diff clutch chatter. An alternate to the DEXRON LS is AMSOIL Severe Gear 75W90 which I have used in three separate model year vettes (06, 07,08) with total success stopping this chatter.
Pro
Joined: Sep 2008
Posts: 644
Likes: 0
From: Chicago Illinois
It really made a huge difference as it's nice and quiet now.
Drifting
Joined: Apr 2006
Posts: 1,276
Likes: 5
From: Ambler Pa.
Probably needs the new fluid. GM changed to a newer fluid late in '08 that doesn't require a separate friction modifier additive.
Here's the TSB:
http://forums.corvetteforum.com/1564283516-post6.html
And here's a DIY on changing, it's doable but takes a little finesse.
http://forums.corvetteforum.com/c6-c...s-for-faq.html
Here's the TSB:
http://forums.corvetteforum.com/1564283516-post6.html
And here's a DIY on changing, it's doable but takes a little finesse.
http://forums.corvetteforum.com/c6-c...s-for-faq.html
Advanced
Joined: Mar 2006
Posts: 56
Likes: 0
From: Richmond Texas
I also had this issue on my 08 and finally had it looked at right before the 36K mark came up. Dealer installed new fluid and did a couple of figure-eights to mix it and good as new; all under warranty.
