for those with "rear end noise"
06-17-2010, 11:23 AM
#21
Le Mans Master
Some on here say the noise is not hurting anything just an annoyance.
I just purchased an 07 coupe about 6 weeks ago with 11k miles and it has the rear end noise when backing out of the driveway after it has been sitting awhile but after that quite as can be.
Question. The TSB #07-04-20-002A I think thats right, is for changing to the Dextron LS
75w-90 with slip lock additive.
Will the dealer change this for free since it has a TSB and is making noise or will I have to pay for it, or is it even needed?
There is a vette mechanic on here from time to time that specializes in rear ends and said there is nothing wrong with it making noise and does no harm whatsoever.
I don't know.
I just purchased an 07 coupe about 6 weeks ago with 11k miles and it has the rear end noise when backing out of the driveway after it has been sitting awhile but after that quite as can be.
Question. The TSB #07-04-20-002A I think thats right, is for changing to the Dextron LS
75w-90 with slip lock additive.
Will the dealer change this for free since it has a TSB and is making noise or will I have to pay for it, or is it even needed?
There is a vette mechanic on here from time to time that specializes in rear ends and said there is nothing wrong with it making noise and does no harm whatsoever.
I don't know.
06-17-2010, 11:27 AM
#22
Burning Brakes
After 30,000 miles, I changed to the new fluid last week and did the tight figure 8s. It fixed the grinding noise I heard while backing.
I'm not sure if it was the new fluid or the 8s, but I'm sure that a fluid change was good for the differential.
PS: Changing rear end fluid on an '05 is a b*tch.
I'm not sure if it was the new fluid or the 8s, but I'm sure that a fluid change was good for the differential.
PS: Changing rear end fluid on an '05 is a b*tch.
The credit card part did hurt a bit when I got the bill, but the noise is gone.
06-17-2010, 12:53 PM
#25
Race Director
Last edited by GOLD72; 06-17-2010 at 12:59 PM.
06-17-2010, 07:06 PM
#26
Le Mans Master
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That is not correct. DEXRON LS didn't become factory fill until MY2009. My son bought a late production 08 coupe (April 2008 build) and I had to change his diff fluid to AMSOIL Severe Gear. I also have a client with an early build 2008 vert that he had to go back to the dealer for a diff fluid change to DEXRON LS to stop the chatter. The only way an 08 might have DEX 6 factory fill would be if it was a near end of production year car. The announcement regarding the new DEX 6 for MY2009 came out half way thru the MY2008 production year. I made the change to AMSOIL SG in Oct 2007 months before DEX 6 was announced.
06-17-2010, 10:59 PM
#27
Le Mans Master
I'm leaving my 06' alone, as my 96' Z-28 had the same problem. I put in the additive and did quiet thing's down a bit, but the posi didn't lock up nearly as effective as it used to. Guess you can't have it all.
06-17-2010, 11:07 PM
#28
Pro
i went with Amsoil 2 years ago, did it myself,
NO NOISE since then
and mine began to sound as if the clutch discs were frozen together
loud embarrassing pops
NO NOISE since then
and mine began to sound as if the clutch discs were frozen together
loud embarrassing pops
06-18-2010, 07:14 AM
#29
Race Director
It is certainly possible that GM made the switch to DEX 6 before 08 production stopped but a dealer would not have access to that info. My son's car was built at the beginning of the 4th week in April and it had diff chatter within a few thousands of miles. Anybody with an 08 car can assume that the factory fill was the old Mr Badwrench fluid.
06-18-2010, 07:28 AM
#30
Safety Car
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I have that "noise" when I back out of my driveway. I also have a MICKEY MOUSE dealership that I refuse to bring my car to for anything. Can I change the fluid by putting my Vert on jack stands and crawling underneath or does it have to be on a lift?
06-18-2010, 08:29 AM
#31
Racer
Look folks, if you want the noise to be GONE FOR GOOD switch to Amsoil Severe Gear 75w-90 and Slip Lock additive. You will NOT hear any noise after that. It does not make any difference if you drive in a straight line, wavy line, backwards, sideways, or up, you will not hear any more NOISE. Never a peep out of mine in 15,000 miles since I changed to Amsoil.
06-18-2010, 09:30 AM
#33
Melting Slicks
That is not correct. DEXRON LS didn't become factory fill until MY2009. My son bought a late production 08 coupe (April 2008 build) and I had to change his diff fluid to AMSOIL Severe Gear. I also have a client with an early build 2008 vert that he had to go back to the dealer for a diff fluid change to DEXRON LS to stop the chatter. The only way an 08 might have DEX 6 factory fill would be if it was a near end of production year car. The announcement regarding the new DEX 6 for MY2009 came out half way thru the MY2008 production year. I made the change to AMSOIL SG in Oct 2007 months before DEX 6 was announced.
/joe
06-18-2010, 11:11 AM
#34
Team Owner
Look folks, if you want the noise to be GONE FOR GOOD switch to Amsoil Severe Gear 75w-90 and Slip Lock additive. You will NOT hear any noise after that. It does not make any difference if you drive in a straight line, wavy line, backwards, sideways, or up, you will not hear any more NOISE. Never a peep out of mine in 15,000 miles since I changed to Amsoil.
06-18-2010, 04:06 PM
#36
Racer
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~5400 miles on my 08, and it does the noise at low speed turns. Sounds like a tire rubbing the fender. My car was built late May 08, picked up at the NCM on 6/13/08. I have not swapped fluids yet, but I intend to to it myself, as I generally don't like dealerships.
I should take it out and figure 8 it a bit to see if that helps.
I should take it out and figure 8 it a bit to see if that helps.
06-19-2010, 02:39 PM
#37
Premium Supporting Vendor
FYI - Dexron VI is for the auto trannies, Dexron LS for the diff.
Aftermarket fix for C6 diff chatter:
AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 (Product Code SVGQT)
AMSOIL Slip-Lock Differential Additive (Product Code ADATB)
AMSOIL Hand Pump (Product Code G2039)
Note: I recommend taking the tip off the fill tube - not needed and you don't want it coming off in your diff.
Though the Severe Gear comes with friction modidier already in it and I don't need extra in my 02 Z06 to prevent diff chatter, for the C6 I recommend a tube of the Slip Lock which seems to work very well at preventing diff chatter as many above have mentioned.
Aftermarket fix for C6 diff chatter:
AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 (Product Code SVGQT)
AMSOIL Slip-Lock Differential Additive (Product Code ADATB)
AMSOIL Hand Pump (Product Code G2039)
Note: I recommend taking the tip off the fill tube - not needed and you don't want it coming off in your diff.
Though the Severe Gear comes with friction modidier already in it and I don't need extra in my 02 Z06 to prevent diff chatter, for the C6 I recommend a tube of the Slip Lock which seems to work very well at preventing diff chatter as many above have mentioned.
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AMSOIL Dealer (Forum Vendor)
AMSOIL Ordering Information (Retail sales using reference #1206638 benefit the forum.)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
AMSOIL Catalog
06-19-2010, 04:16 PM
#39
Instructor
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My 82 Trans-AM had a similar rear end noise. The dealer put in an additive and did figure 8's. I did the same thing every 20K miles for the next 160K miles and it never came back. I sure would have thought GM would have figured out how to solve this by now.