Differential Chatter
Le Mans Master
Joined: Dec 2005
Posts: 7,753
Likes: 210
From: North Western Connecticut
I didn't go the Aimsol route becuase the dealership said it would void the warranty- not anauthorized GM part or fluid. Nonetheless I did the diff fluid change, added 2 of the sliplock additive and did figure eights untill I was throughly dizzy.
Result: Considerably reduced clunking in the rear- occassional or intermittent when you go on/off throttle quickly. But this is about a 95% improvement.
Now I need to address the Torque management issue with the A6 tranny pretty much holding back the shifts at the low end first to second.
Result: Considerably reduced clunking in the rear- occassional or intermittent when you go on/off throttle quickly. But this is about a 95% improvement.
Now I need to address the Torque management issue with the A6 tranny pretty much holding back the shifts at the low end first to second.
Team Owner
Joined: Sep 2005
Posts: 29,113
Likes: 2,194
From: Big Bend Country, TX
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15- '16-'17-‘18-‘19-'20-'21
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Race Director
Joined: Sep 2000
Posts: 11,139
Likes: 1,912
From: Missouri City, TX
If a aftermarket product meets or exceeds GM requirements, you are good to go. And AMSOIL does. I will be using their ATF for the tranny and motor oils for the engine in the near future. The owners manual and/or service manuals will give you the generic requirements for the fluids. You are not limited to Mr BadWrench fluids. If GM is so proud of their fluids, why don't they ever tell us who makes them?? Why?? Because they are sourced out to the lowest bidder meeting their minimum specs. ExxonMobil must have an agreement with GM to get the Mobil One product name on the oil filler cap. There are several products superior to Mobil One including AMSOIL, Royal Purple, etc.
Last edited by GOLD72; Oct 26, 2007 at 07:44 AM.
Le Mans Master
Joined: Dec 2005
Posts: 7,753
Likes: 210
From: North Western Connecticut
I bet your dealership will also tell you that you have to use MOBIL 1 for the engine oil just because the filler cap says MOBIL 1. If a aftermarket product meets or exceeds GM requirements, you are good to go. And AMSOIL does. I will be using their ATF for the tranny and motor oils for the engine in the near future. The owners manual and/or service manuals will give you the generic requirements for the fluids. You are not limited to Mr BadWrench fluids. If GM is so proud of their fluids, why don't they ever tell us who makes them?? Why?? Because they are sourced out to the lowest bidder meeting their minimum specs. ExxonMobil must have an agreement with GM to get the Mobil One product name on the oil filler cap. There are several products superior to Mobil One including AMSOIL, Royal Purple, etc.
If a aftermarket product meets or exceeds GM requirements, you are good to go. And AMSOIL does. I will be using their ATF for the tranny and motor oils for the engine in the near future. The owners manual and/or service manuals will give you the generic requirements for the fluids. You are not limited to Mr BadWrench fluids. If GM is so proud of their fluids, why don't they ever tell us who makes them?? Why?? Because they are sourced out to the lowest bidder meeting their minimum specs. ExxonMobil must have an agreement with GM to get the Mobil One product name on the oil filler cap. There are several products superior to Mobil One including AMSOIL, Royal Purple, etc.
Race Director
Joined: Sep 2000
Posts: 11,139
Likes: 1,912
From: Missouri City, TX
I find it amazing how many forum members switched the differential fluid to Amsoil and the rear end chatter disappeared. For what it's costing GM to do all the warranty work on this problem you'd think someone might figure out Amsoil might be the solution. Perhaps they're under some contact to use the Bad Wrench fluids from the factory, but certainly not at dealerships. I now have ZERO differential noise and it's been a couple of months. I might add mine is not a DD and spends a lot of time sitting in the garage. I believe cars that sit around a lot exacerbate the noise problem simply from disuse. I'm thinking of changing to Amsoil for my MN6 tranny........
Instructor
Joined: Sep 2006
Posts: 122
Likes: 0
hmmm...Just wondering why the dealer hit you with a $40.00 labor charge. Seems to me you saved the service department from a world-of-hurt by not having to spend his mechanics time and re-visits trying to solve the problem the GM-way especially since you picked up the tab for the fluids.
Safety Car
Joined: Aug 2006
Posts: 4,206
Likes: 6
From: Makena, Maui & NM
Now I need to address the Torque management issue with the A6 tranny pretty much holding back the shifts at the low end first to second
Nothing that a tune with a HP tuner with Software Version 2.2 cant permanently cure! Just bought one myself and easy as pie disabling TM upshifts and power downshifts on the C6 A6.
Nothing that a tune with a HP tuner with Software Version 2.2 cant permanently cure! Just bought one myself and easy as pie disabling TM upshifts and power downshifts on the C6 A6.
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Heel & Toe
Joined: Mar 2006
Posts: 22
Likes: 0
From: virginia
Chatter fix
I also had the chatter problem on my 06 A6 at about 5,000 miles. I took it to the dealer for the diff. fluid and additive fix, that worked for about 10,000 miles but the problem came back worse than before,so I got amsoil and the additive and things have been great so far. I only have 2,500 miles on the new fluid. We'll see how long this lasts.
1st Gear
Joined: Oct 2007
Posts: 1
Likes: 0
Hi Fox !! I just got my vette out of the dealer. I took it in again for the same problem you and everyone else is having with the differential. They told me that around mid november this year, GM is coming out with a repair kit to take care of this problem.
Le Mans Master
Joined: Dec 2005
Posts: 7,753
Likes: 210
From: North Western Connecticut
Melting Slicks
Joined: Sep 2004
Posts: 3,488
Likes: 27
From: Long Island NY
The previouis TSB, as of 12/06, stated to change the clutch packs if the fluid swap did not work, but the latest TSB as of 4/07 no longer calls for a clutch pack swap.
We already know too that a good amount of those who have had their clutch packs changed have experienced the chatter again... I guess GM finally figured out that changing the clutch packs was not the answer.
So far it seems that using 8 ounces of friction modifier additive as opposed to the originally specified 4 ounces, when doing an oil swap, is perhaps the best solution so far.
Regarding Amsoil, my guess is that the formula they use is simply heavy with "friction modifier", nice and slick... which is why it is yielding good results.
TSBs:
http://forums.corvetteforum.com/show...24&postcount=2
Race Director
Joined: Sep 2000
Posts: 11,139
Likes: 1,912
From: Missouri City, TX
I really don't think so. If there is a kit, it's a set of replacement clutch packs. Many of the previous replacements don't sound like they have been the long term solution. Dealers are famous for dis-information. You have nothing to lose by trying AMSOIL.