When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
If memory serves, I think I saw a post where a "warbler" went in for service, they opened up the differential and found metal in the oil. That would make sense since the issue has been described as a ring/pinion gear assembly problem. So if it's true there is metal in the oil in these 'warblers" the last thing I would be doing is waiting for a TSB or something.
Metal in oil is a major failure just waiting to happen....not if, just when.IMHO
I may have been that person. I was one of the first to get my diff replaced. Both the GM engineer testing my car and the service manager attested to not only silvery colored oil but an abnormal wear pattern on the ring gear. To this, I would add that the engineer said that the wear had progressed to the point that it was sounding off all the time but you couldn't hear the newer noise over the engine/exhaust.
Last edited by Highplains; 03-23-2017 at 04:57 PM.
If the base and z51/zo6 have different differentials and both have the warble will changing the differential fix the warble . I have the base model and it's in the shop now getting the swap . Who on here has the z51 or the zo6 that has the warble issue ? Just curious !
I have a Z06 and have the issue. I've posted here before but I don't think anyone wants to believe me LOL. A8 trans and every time I notice it the engine is sitting on 1500 RPMs.
Originally Posted by rmorin1249
Well then I'll bring it up at my oil change in a few weeks. If they won't replace the diff I'm headed out west and if it makes the trip I'll dump it when we get home. I'm tired of the issue.
Have my oil change scheduled on Monday and I'll let the service people know and see what answer I get
I have a Z06 and have the issue. I've posted here before but I don't think anyone wants to believe me LOL. A8 trans and every time I notice it the engine is sitting on 1500 RPMs.
Easy for me to believe. Same 2:41 rear gear ratio and the base A8 Stingray which seems to make up the majority of complaints.
I printed out the posts pointing the problem coming from the diff and took to my dealer.
I also took the tech for a ride to show him the chirping noise.
However, he did not think the noise coming from the diff. He asked me to leave my vette in the dealership next week for several days for him to diagnose the problem. My vette is C7, Z51, 2LT, Bought it brand new a few months ago, having the noise since day 1, at about RPM 1600, typically when going up a hill.
I am very worried and don't know what to do!
I uploaded the video that I took with the noise to YouTube:
That doesn't sound like the warble noise referenced here. Also, I noticed the noise in all those videos kinda correlate to when your tach was around 2000 rpm and goes away as soon as the tach drops.
Thanks! You are right that the noises will drop off after an even higher pitch sound when the rpm is over 1800 or so. My impression of the noises when I heard them the first time was "there is a tree leaf near a vacuum intake, so it creates some chirping/whistling-like noises when the vacuum is sucking air, and then the noises drop off when the leaf is sucked to close up the vacuum intake."
Now what I should do?
Originally Posted by hangman
That doesn't sound like the warble noise referenced here. Also, I noticed the noise in all those videos kinda correlate to when your tach was around 2000 rpm and goes away as soon as the tach drops.
I printed out the posts pointing the problem coming from the diff and took to my dealer.
I also took the tech for a ride to show him the chirping noise.
However, he did not think the noise coming from the diff. He asked me to leave my vette in the dealership next week for several days for him to diagnose the problem. My vette is C7, Z51, 2LT, Bought it brand new a few months ago, having the noise since day 1, at about RPM 1600, typically when going up a hill.
I am very worried and don't know what to do!
I uploaded the video that I took with the noise to YouTube:
Can someone please check and tell me if it is the same as that from the defect diff? Thanks!
I printed out the posts pointing the problem coming from the diff and took to my dealer.
I also took the tech for a ride to show him the chirping noise.
However, he did not think the noise coming from the diff. He asked me to leave my vette in the dealership next week for several days for him to diagnose the problem. My vette is C7, Z51, 2LT, Bought it brand new a few months ago, having the noise since day 1, at about RPM 1600, typically when going up a hill.
I am very worried and don't know what to do!
I uploaded the video that I took with the noise to YouTube:
Sounds like an exhaust leak to me.
Mine did the same sound when my corsa xpipe wasn't properly clamped down.
To me, I would think the sounds/noise is coming from some moving parts (like a valve or so), that is, something vibrating, doesn't appears from a fixed size leak of hole.
To me, I would think the sounds/noise is coming from some moving parts (like a valve or so), that is, something vibrating, doesn't appears from a fixed size leak of hole.
What I noticed in the video is that it occurs when switching from v4 to v8. Right before the switch the afm valves are closed and the change in flow can be heard right before the afm valves open. Some leakage of gases is occuring where the xpipe connects with the muffler pipes. I quickly fixed this by wrapping some metallic exhaust tape all around the slip fit connection because I've been too lazy to reattach everything properly myself. like I said above, my car sounded exactly the same . Keep us updated .
What I noticed in the video is that it occurs when switching from v4 to v8. Right before the switch the afm valves are closed and the change in flow can be heard right before the afm valves open. Some leakage of gases is occuring where the xpipe connects with the muffler pipes. I quickly fixed this by wrapping some metallic exhaust tape all around the slip fit connection because I've been too lazy to reattach everything properly myself. like I said above, my car sounded exactly the same . Keep us updated .
Thanks! Is the place in the picture where the xpipe connects with the muffler pipes?
See attached photo
Where the clamp wraps around the pipe. You can see the metallic tape.
Thanks for the detailed picture. It took me a while to crawl under the car to try to find out the place. It seems my model is somewhat different from yours:
I traversed the pipe and it is connected to the muffler. On the join, there is a small hole:
I am not sure if it is the cause but will use some metallic type as you said to test.
Thanks for the detailed picture. It took me a while to crawl under the car to try to find out the place. It seems my model is somewhat different from yours:
I traversed the pipe and it is connected to the muffler. On the join, there is a small hole:
I am not sure if it is the cause but will use some metallic type as you said to test.
On your top pic you can see some black soot where there is likely the leak mine has. Look at the pipe behind the xpipe(going to muffler).... there should be a little dimple. This is a little stopper to make sure that the pipe is all the way into the xpipe. Several on here have noticed that the muffler pipe is not seated all the way into the xpipe.
03-23-2017, 04:54 PM
Have my oil change scheduled on Monday and I'll let the service people know and see what answer I get 
