Many thanks for you advise. My friend on his C6 did his the day before and it solved the problem. The C6 has a lower capacity of 1.69 quarts vs. 2.79 on the ZO6 so my additive ratio is less. I Know GM latest tech bulletin says add two but I saw a posting that said only add one when using amsiol as it has move additive in the severe gear oil to start with. This is really spoilng my enjoyment of the car. In the UK we have to pay twice the price for the cars in the first place due to taxes - they are £62,000 for top spec brand new so I dont want a beautiful looking car sounding like its does. Thanks for you help and advise i raelly hope this will work.
it did it on my 01 and does it on my 07 z [32,000 miles] but only when cold and first starting out from my drive way.it doesnt hurt or bother me.o yea my 01 had 118000 miles on it
I just purchased a used 2004 Z06. It has 20,200 miles on it. Under hard acceleration the rear end chatters. With the traction control on or off. I also notice it when making shape turns forward or reverse. Is this as simple as changing the fluid in the rear end.
I got mine changed at weekend and used two amsoil ltd slip- Tried one at first and did not work. I drove from the garage and did my figures of eight by it made no difference. I then took the car on an 8 mile run and then did the figures eights and the noise went. Think I need to take the car on a good run to work the oil into the clutch packs.
I just purchased a used 2004 Z06. It has 20,200 miles on it. Under hard acceleration the rear end chatters. With the traction control on or off. I also notice it when making shape turns forward or reverse. Is this as simple as changing the fluid in the rear end.
Congratulations on the C5Z and welcome to
If you just got the car, not a bad idea to change the fluid.
If you use a fluid that requires separate additive, get two bottles; add one and hold one. (I think the C6Z requires two bottles, but I know the C5Z does not)
If you use a fluid with additive included, e.g., Amsoil synthetic 75-90 severe gear, get a 4 oz bottle of additive. Don't "add the additive" initially.
Do the figure 8 drill to work in the new fluid.
If you still have chatter after couple hundred miles, add some more additive.
If that doesn't cure it, you have potential diff clutch pack problems.
HTH ... good luck
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I just took delivery of an '08 and it chatters on right turns from a stop. It did it at only 11 miles on the odometer so it's obviously a factory problem. They told me at the service department it was a friction additive issue. They said they didn't want to change the fluid until the break-in period was over and that the problem may correct itself. Not bloody likely from what I've read here.
I just took delivery of an '08 and it chatters on right turns from a stop. It did it at only 11 miles on the odometer so it's obviously a factory problem. They told me at the service department it was a friction additive issue. They said they didn't want to change the fluid until the break-in period was over and that the problem may correct itself. Not bloody likely from what I've read here.
I have an 06 and they replaed the fluid + added the friction additive. The chatter has come back again and my Chevy dealer says there is a new fluid out that will stop this. They had to order it and I am going to see if it takes care of it.
This is an old thread and at first I didn't think it related to my Z. It is still very new and I am still getting use to any funny noises. So far, I've had no problems. Knock on wood. However, my previous '02 C5Z, which I bought new and owned for seven years had symptoms of this nature. I went back and forth to the dealer (under warranty) several times. They replaced the rear end lub and added GM's recommended friction modifier fluid to no avail. The funny noise and vibration only occur when cold and immediately while turning all the way right or left (going foward or backing up) from a parked position. While still moving, within a matter of seconds the symptom went away. This only occurred during really cold weather, never during the warmer months. It was extremely difficult to "demonstrate" the problem to the service people at the dealership. I could never get it to act up while it was in their care for service. They weren't even convinced there was a problem let alone that it was related to the rear end, but I certainly had my suspicions. I also suspected it had something to due with the tires themselves. Anyway, the car has since changed hands but all the while I owned it this "issue" never resulted in any serious problem. Eventually, I came to live with it as something of no consequence and only a minor hinderance to my enjoyment of the car. Yet another unsolved mystery with some of these cars.
88862624 Dexron LS is the one fluid that GM has that doesnt require frictional modifier and can be used on all Getrag differentials.
This fluid is engineered to be used in all Getrag differentials ONLY, not in any other diff!!!!
Allthebest, c4c5
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GM World Class Certified Service Technician. Chevrolet Professional Service Guild. Museum member #7993. http://www.corvettemechanic.com
88862624 Dexron LS is the one fluid that GM has that doesnt require frictional modifier and can be used on all Getrag differentials.
This fluid is engineered to be used in all Getrag differentials ONLY, not in any other diff!!!!
Allthebest, c4c5
Does this fluid replace the Dexron with friction modifier or can be used in lieu of?
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Does this fluid replace the Dexron with friction modifier or can be used in lieu of?
The new fluid is similar to aftermarket fluids like the AMSOIL Severe Gear 75w90 that already come with some friction modifier in them.
Note that this is a gear lube and not a transmission fluid. Don't confuse the Dexron in the name with the tranny spec of Dexron III. Not the same thing.
HI there,
Honestly, I can give 2 instances where aftermarket fluids created belleville washer breakage due to clutch overheating. Too much slip, created undue heat and washer breakage. This is why correct slip vs not enough vs too much is so critical in the Getrag differentials.
Now, thats all subject to interpretation by fluid analysis, frictional stability and other factors but even still.
Personally, its about the same price as any aftermarket fluid and has been validated by GM on this issue. Why would you NOT install the GM stuff that was specifically engineered??
DEXRON LS is the designation with part number 88862624, that is the fluid that should be used and NOTHING else should be added to it.
Allthebest, c4c5
The manual part # for all vettes is #89021677 (synthetic gear lube 75w-90) and fr mod # is 1052358..Please correct me if I'm wrong. (then on 7-73 it says part # 1237826 whcih I can't find anywhere on the internet!!?! - I guess that's a typo?) <=== this info seems to be old:
The Dexron LS is new and doesn't need additive.
on 7-72 it states "adding friction modifier without draining will not correct this condition", just FYI as some have posted that that is what their dealers did. I have no chatter so I'm going to change fluid just for maintenance.
It seems that my service manual cutoff date of 11/15/07 was just before the dexron LS came out. I don't know if I have the new stuff in my rear end, but I'm changing it at 6000 miles just for maintenance reasons, no rear end issues. My build date is 2/08, so I bet it's got the new stuff in there, but hard to say.
Also, I know it's an old thread, but capacities of rear diff are:
base/export/Z06: 1.97/2.11/2.70qt lube and 4.7/5.4/6.8oz. FM..This is of course for the GM spec stuff..All info up to date as of 11/15/07..The above chap from UK, is yours an export C6 base vette? If so, maybe you need more in?
I have a couple of questions:
is there a part number for the "retaining ring" for the diff oil cooler quick connect fitting, as it looks like a part needing to be replaced every change? I assume then the fluid runs out when you remove the hose and you don't have to remove a nut?
Also, for diff cooler vettes, it says you have to lift the car and spin the wheels in 2nd gear then recheck the fluid, can't I just check the fluid after a very short gentle drive around the block? (I'll answer this one: yes )
Any info about this minor stuff would put my mind at ease before I start messing with my baby.
Thanks in advance!
Last edited by zeta08 : 09-14-2008 at 02:35 PM.
Reason: clarifying part #s
I purchased my 2007 Corvette last March after 6 solid years with my 2000 Corvette. Im not rich at all and spent my life savings to buy this car. I thought it was the best American car made?
Im no mechanic so excuse my ignorance. I had to have the (clutch packs?) totally replaced after 4000 miles. I just reached 19000 and the same noise is back. Both times I took it in and the dealership said "thats unfortunate". My warranty is up at 36K I think? Which is just about the time it would go out again if history repeates itself.
Is this just something that happens over and over with most Corvettes or is my car one of the chosen few?
Is this a costly repair when the waranty is up?
I feel like I'm driving a used car and its barely a year old.
Is there any chance of getting a GM buy back if this happens over and over or am I dreaming in fantasy land?
Anyway I love the car its still a great car but very frustrating to have these problems with a new car.
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