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Old 05-15-2013, 02:38 PM   #1
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Rear end making a winding noise and GM bulletin regarding it.

I dont drive my car as often as I want to and after 7 months I have about 4300 miles. I took it in to the dealer to have the oil changed and I mentioned the winding noise in the rear end when I am backing up out of my driveway and turning at the same time. I can hear it going forward and turning as well. I know for sure the tires are not rubbing. The dealer told me he had to order parts that there was a bulletin. Anyone heard of this? I asked him to see the copy of the bulletin, so I can look for myself.
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Old 05-15-2013, 02:46 PM   #2
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That might be the bulletin for the SS where they put in new seals and fluid. You don't need that done on the ZL1. It is posted in here somewhere if you do a search.
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Old 05-15-2013, 02:55 PM   #3
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My car makes the same noise. Please post when you find out someything!
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Old 05-15-2013, 03:05 PM   #4
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Take it to the dealer they may need to flush the rearend. Mine did the same, they flushed it, refilled it and it went away. Many other people have had the sane problem. They figure some of the lashing compound is responsible.
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Old 05-15-2013, 03:39 PM   #5
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I thought it may be for the SS also that's why I wanted to see the bulletin and post this. I really don't want them tearing into my rear end.
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Old 05-15-2013, 03:46 PM   #6
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I thought it may be for the SS also that's why I wanted to see the bulletin and post this. I really don't want them tearing into my rear end.
That bulletin is not for the ZL1, they are different, it has been confirmed here on other threads.
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Old 05-15-2013, 03:55 PM   #7
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I had mine to the Dealer twice, the first time they replaces the ring and pinion. They said the backlash was off, it was quiet for awhile and the noise came back. Next time they flushed it and refilled and it has been quiet since. Don't know if this is the universal fix but it worked for me. Below is the bulletin.

Subject:Rear Axle Chatter Type Noise on Low Speed Turns (Excluding ZL1)

Models:2010-2012 Chevrolet Camaro (Excluding ZL1)
Equipped with Limited-Slip Differential (RPO G80)


Attention:For 2010 and 2011 vehicles built prior to August 25, 2010, if the chatter noise you are experiencing occurs only in Reverse while making a turn, please review the latest version of PIC5424.
This PI is being revised to add an Attention statement and update the Recommendation/Instructions. Please discard PI0137B.The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern


Some customers may comment on a chatter-type noise from the rear of the vehicle while making low speed turns.
This condition may be caused by a slip/stick of the posi-traction clutch plates. As the plates slip and stick, a jumping or jerking feel occurs, accompanied by a chatter noise.

Recommendation/Instructions

Caution: The rear axle seals must be replaced. The original seals are not compatible with the new fluid.

Replace both rear axle shaft seals with GM P/N 22798805 and drain/refill the rear differential with new fluid, GM P/N 88862624 (in Canada, use P/N 88862625). Refer to the Rear Axle Shaft Seal and Differential Oil Replacement procedures in SI. This fluid includes a limited-slip additive (friction modifier) already added. DO NOT add any limited-slip additive (friction modifier).
Important: Please advise the customer that once the differential fluid has been changed, it may take as long as 805 km (500 miles) for the lubricant to fully penetrate the limited slip clutch plates. During this period some chatter may still be felt on initial startup while making slow turns until the rear differential fluid warms up.

Note: DO NOT re-use the wheel drive shaft nut. Replace with NEW only.
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Old 05-15-2013, 06:39 PM   #8
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Originally Posted by Sven59 View Post
I had mine to the Dealer twice, the first time they replaces the ring and pinion. They said the backlash was off, it was quiet for awhile and the noise came back. Next time they flushed it and refilled and it has been quiet since. Don't know if this is the universal fix but it worked for me.
Did this also fix the slight whinning noise that we get when lightly on the throttle at highway speed?
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Old 05-15-2013, 07:41 PM   #9
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Sigh! Here we go again. This is all you need to fix it.

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Old 05-15-2013, 09:12 PM   #10
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Sigh! Here we go again. This is all you need to fix it.

Put the whole bottle in!
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Old 05-15-2013, 09:41 PM   #11
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Not winding, but chatter or what ever, I have a knock when I would make a tight turn at low speeds, like backing out of the driveway. I took it to the dealer, this has been a while and since they hadn't worked on a ZL1 yet they got on the hotline. What they came up with, they changed the fluid, was that it was normal until the rear end got warm. So since then I have noticed that once I make it a 1/8 or 1/4 mile down the road it doesn't do it anymore.

I don't know.
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Old 05-15-2013, 09:56 PM   #12
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Had this issue on my ZL1 - they replaced the rear diff fluid, performed several figure 8s etc and the problem was gone.

That's all that they will need to do with yours too I would imagine
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Old 05-15-2013, 10:05 PM   #13
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Talking

I really don't want them tearing into my rear end.[/QUOTE]

That's what she said!
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Old 05-15-2013, 10:38 PM   #14
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Quote:
Originally Posted by ZO6 Bryan View Post
Sigh! Here we go again. This is all you need to fix it.

Not true.. If you use the recommended rear diff fluid for the ZL1, it already has the lim slip in it.. I had the same issue.. I bought 3Qt and did the flush in my garage, problem fixed..
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Old 05-16-2013, 12:20 AM   #15
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What do you mean flush? Did you just drain it completely and put in new fluid, or did you flush it out with something?
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Old 05-16-2013, 06:27 AM   #16
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my dealer refused this repair for me because firstly by the time i get to dealer the rear is warmed up and doesnt make the noise for them and secondly because the damn service bulletin says not to do this fix on ZL-1. mine has been making this noise for 20k miles now and its worse on colder mornings
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Old 05-16-2013, 06:55 AM   #17
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my dealer refused this repair for me because firstly by the time i get to dealer the rear is warmed up and doesnt make the noise for them and secondly because the damn service bulletin says not to do this fix on ZL-1. mine has been making this noise for 20k miles now and its worse on colder mornings
You need to go to a different dealer then!

Starling fixed mine without even a question - been fine ever since
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Old 05-16-2013, 07:05 AM   #18
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Not true.. If you use the recommended rear diff fluid for the ZL1, it already has the lim slip in it.. I had the same issue.. I bought 3Qt and did the flush in my garage, problem fixed..
Sold over the counter at Chevy parts, the 1 qt. bottle of synthetic gear lube with friction inhibitor is the factory replacement lube. I changed my rear axle fluid last week. 1,600 miles. I had many of the same, normal noise issues as most others associated with the ZL1. I diagnosed mine as normal break in with a HD posi rear. Both magnetic plugs had a yellow base accumulation on them, then layered with the dark grey build up of contamination totalling approx. 1/2" thick. Also there were several small slivers of metal. I highly recommend everyone change the rear axle fluid. I will post the GM P/N later.
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Old 05-16-2013, 07:07 AM   #19
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Originally Posted by OldScoolCamaro View Post
True. Sold over the counter at Chevy parts, the 1 qt. bottle of synthetic gear lube with friction inhibitor is the factory replacement lube. I changed my rear axle fluid last week. 1,600 miles. I had many of the same, normal noise issues as most others associated with the ZL1. I diagnosed mine as normal break in with a HD posi rear. Both magnetic plugs had a yellow base accumulation on them, then layered with the dark grey build up of contamination totqlling approx. 1/2" thick. Also there were several small slivers of metal. I highly recommend everyone change the rear axle fluid. I will post the GM P/N later.


I know I have an SS, but I saw pretty much the same gunk, crap, etc. in my fluid when I changed it at 1,500.
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Old 05-16-2013, 07:22 AM   #20
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Originally Posted by Sven59 View Post
That bulletin is not for the ZL1, they are different, it has been confirmed here on other threads.
I had the same issue on my ZL1. The dealership still honored the TSB and changed the fluid and seals. The noise has gone away.

I have a feeling that the TSB will need to be expanded to include the ZL1
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Old 05-16-2013, 07:57 AM   #21
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Quote:
Originally Posted by Bowtie724 View Post
I dont drive my car as often as I want to and after 7 months I have about 4300 miles. I took it in to the dealer to have the oil changed and I mentioned the winding noise in the rear end when I am backing up out of my driveway and turning at the same time. I can hear it going forward and turning as well. I know for sure the tires are not rubbing. The dealer told me he had to order parts that there was a bulletin. Anyone heard of this? I asked him to see the copy of the bulletin, so I can look for myself.
Yes I had the same thing happen to me @5k on my 2012 ZL1. The parts they had to order for mine were seals. They had none anywhere close to the dealership and took over a week for them to arrive. Seems the 2012's have the same issue when they reach the magical reading of @5k on the odometer.
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Old 05-16-2013, 08:23 AM   #22
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Originally Posted by Al C. View Post
Not true.. If you use the recommended rear diff fluid for the ZL1, it already has the lim slip in it.. I had the same issue.. I bought 3Qt and did the flush in my garage, problem fixed..
I changed mine too. It comes back. Put some additive in and it will be silent.
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Old 05-16-2013, 09:18 AM   #23
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What do you mean flush? Did you just drain it completely and put in new fluid, or did you flush it out with something?
Sorry bad choice of vocabulary... Drain and refill with new fluid.


Quote:
Originally Posted by OldScoolCamaro View Post
Sold over the counter at Chevy parts, the 1 qt. bottle of synthetic gear lube with friction inhibitor is the factory replacement lube. I changed my rear axle fluid last week. 1,600 miles. I had many of the same, normal noise issues as most others associated with the ZL1. I diagnosed mine as normal break in with a HD posi rear. Both magnetic plugs had a yellow base accumulation on them, then layered with the dark grey build up of contamination totalling approx. 1/2" thick. Also there were several small slivers of metal. I highly recommend everyone change the rear axle fluid. I will post the GM P/N later.
If you have to add the limited slip inhibitor, you are not using the correct fluid..
The ZL1 has a specific fluid, not like the SS, that has the inhibitor already in it and it is advised NOT to add any additional lim slip.
GM PART NUMBER: 88862624. My plugs looked like what u described when I drained the rear end and I agree fork out the $70-80 to change ur diff fluid.. If that doesn't work, which it will, take to the dealer..

Quote:
Originally Posted by ZO6 Bryan View Post
I changed mine too. It comes back. Put some additive in and it will be silent.
.. If you filled with the fluid that has the inhibitor and added additional lim slip to it, not good. I'm sure it will have some "results" but definitely not advised.
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Old 05-16-2013, 09:34 AM   #24
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Did this also fix the slight whinning noise that we get when lightly on the throttle at highway speed?
Yes!
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Old 05-16-2013, 10:54 AM   #25
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Sorry bad choice of vocabulary... Drain and refill with new fluid.




If you have to add the limited slip inhibitor, you are not using the correct fluid..
The ZL1 has a specific fluid, not like the SS, that has the inhibitor already in it and it is advised NOT to add any additional lim slip.
GM PART NUMBER: 88862624. My plugs looked like what u described when I drained the rear end and I agree fork out the $70-80 to change ur diff fluid.. If that doesn't work, which it will, take to the dealer..



.. If you filled with the fluid that has the inhibitor and added additional lim slip to it, not good. I'm sure it will have some "results" but definitely not advised.


Who says that they aren't compatable? The ZL1 comes with SYTHETIC Limited Slip fluid. The SS comes with convetional limited slip fluid. There is nothing magic about the GM recommended fluid. Just stick to the synthetic fluid. The TSB for the SS has them replace the convetional LS fluid with the synthetic fluid. So there is no need to tear down the rear end to replace seals in the ZL1. This is not a new problem. Noise from clutchs in limited slip rear ends has been around since they were invented decades ago. If you had a 20 yr old car with limited slip then put the additive if its noisy. If your ZL1 is noisy do the same thing.
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