C6 Differential
Thread Starter
Navigator
Joined: May 2013
Posts: 9
Likes: 0
From: Marina California
C6 Differential
I bought a 2007 Corvette about a year ago and it had about 19,000 miles on it. My mechanic inspected when I bought and all seemed fine. I drive the Vette daily and a few weeks after purchase, started to notice a sound which turned out to be the differential. Had it serviced in September at 24,000 miles on it. Everything was fine for several months, but then started to hear the noise again and had differential serviced again in March at 27,000 miles. After a couple of weeks, I started to hear the noise from the differential again (kind of a grinding sound). It is sporadic but I want to know what to do to get rid of this. I'm a gal and don't know much about cars. Any advice would be appreciated,
Sandy
Sandy
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
There are a few different sounds that can come from the dif.
In order to get the best help here it would be nice if you could elaborate on exactly what kind of sound you are hearing.
In order to get the best help here it would be nice if you could elaborate on exactly what kind of sound you are hearing.
Thread Starter
Navigator
Joined: May 2013
Posts: 9
Likes: 0
From: Marina California
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Do you know if your mechanic has used the correct oil, without extra friction modifier? And did he, or you, do a series of slow "figure 8's" to work the new oil into the clutches after the refill?
See post 6 in here for the GM service bulletin:
http://forums.corvetteforum.com/c6-c...tial-lube.html
See post 6 in here for the GM service bulletin:
http://forums.corvetteforum.com/c6-c...tial-lube.html
Thread Starter
Navigator
Joined: May 2013
Posts: 9
Likes: 0
From: Marina California
Do you know if your mechanic has used the correct oil, without extra friction modifier? And did he, or you, do a series of slow "figure 8's" to work the new oil into the clutches after the refill?
See post 6 in here for the GM service bulletin:
http://forums.corvetteforum.com/c6-c...tial-lube.html
See post 6 in here for the GM service bulletin:
http://forums.corvetteforum.com/c6-c...tial-lube.html
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
its the clutch pack , drain gear oil and put in royal purple or some equivalent with the additive for limited slip already in the gear oil and add another bottle of additive and you wont here the noise again, and the locker will work great spin both wheels, if you put the new gm gear oil to fix the noise it will probably do 1 leg burnouts
Team Owner
Joined: Sep 2000
Posts: 24,953
Likes: 2,668
From: Far NW 'burbs of Chicago
St. Jude Donor '13
Our 2009 now at 70k miles came with the new GM diff fluid (which does NOT need an extra additive), lights up both tires together. Never any noise from the diff, either. Lots of satisfied customers with the new GM spec fluid.
My guess is that if the GM fluid doesn't quiet his diff, neither will any other brand.
My guess is that if the GM fluid doesn't quiet his diff, neither will any other brand.
Melting Slicks
Joined: Jul 2010
Posts: 2,998
Likes: 238
From: Surprise, Az
"if you put the new gm gear oil to fix the noise it will probably do 1 leg burnouts"
Haven't heard that one before. The GM LS oil is supposed to be pretty good with the friction modifiers already added.
Sandy, if the correct oil was installed, you may not have to take it back to have it replaced a third time. I would try the low speed figure 8's first to see if that corrects the problem.
Haven't heard that one before. The GM LS oil is supposed to be pretty good with the friction modifiers already added.
Sandy, if the correct oil was installed, you may not have to take it back to have it replaced a third time. I would try the low speed figure 8's first to see if that corrects the problem.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
"if you put the new gm gear oil to fix the noise it will probably do 1 leg burnouts"
Haven't heard that one before. The GM LS oil is supposed to be pretty good with the friction modifiers already added.
Sandy, if the correct oil was installed, you may not have to take it back to have it replaced a third time. I would try the low speed figure 8's first to see if that corrects the problem.
Haven't heard that one before. The GM LS oil is supposed to be pretty good with the friction modifiers already added.
Sandy, if the correct oil was installed, you may not have to take it back to have it replaced a third time. I would try the low speed figure 8's first to see if that corrects the problem.
Our 2009 now at 70k miles came with the new GM diff fluid (which does NOT need an extra additive), lights up both tires together. Never any noise from the diff, either. Lots of satisfied customers with the new GM spec fluid.
My guess is that if the GM fluid doesn't quiet his diff, neither will any other brand.
My guess is that if the GM fluid doesn't quiet his diff, neither will any other brand.
no more noise, car seemed to take off straighter seemed to stop fish tailing, went to track peg leg burnouts, had to do the burnout closer to the water after going threw it, everybody said need new clutch packs, so I decided to try new oil, got royal purple, it has the additive already in it. didnt see a change so I added more additive and did the 8s and then it started fish tailing, now its been two more years and two sets of drag radials and its never peg legged again, and yes I was satisfied with the new gm fluid, no noise and it was fine in everyday driving but the drag strip proved it wrong
Safety Car
Joined: May 2011
Posts: 3,807
Likes: 508
From: Oshawa, Ontario
probably wrong fluid
Thank for info about figure 8's. I did not do this and I don't think the mechanic did either as I was there when work was completed and he did not leave with the car after servicing differential. I will have it serviced again and request the figure 8's or do that myself. Thanks very much for your help.
Race Director
Joined: Sep 2000
Posts: 11,097
Likes: 1,864
From: Missouri City, TX
She may have to buy the fluid herself and bring it to the mechanic. It's called DEXRON LS.