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-   -   ZL1 Rear end noise (https://www.camaro5.com/forums/showthread.php?t=299450)

Jamesdman24 06-02-2013 10:28 PM

ZL1 Rear end noise
 
I have a 2012 ZL1. The rear end makes this weird humming noise, similar to the sound when your power steering is low, coming from the rear when the wheels are cranked in either reverse or forward. Any help would be great!!!

BeardWS6 06-03-2013 04:13 AM

Same here when she is cold. Once heated up it goes away! 2013 ZL1

Rizzo 06-03-2013 08:00 AM

Quote:

Originally Posted by BeardWS6 (Post 6621765)
Same here when she is cold. Once heated up it goes away! 2013 ZL1

I had the same issue. I found the TSB that relates to the issue that the SS has and the dealership honored the work. They replaced the fluid in the rear diff and also changed out the seals (per the TSB).

Since then, I haven't had the sound reappear. I think GM should look at extending the TSB to officially support the ZL1 as well.

CROWN 06-03-2013 10:49 PM

theres a private bulletin for the zl1's. Calls to flush the fluid about 3 times and in between those drive it so many miles doing so many figure 8's and a lot of nonsense, all in all majority of the time they are replacing the whole rear end, and when you get it supose to take apart the cover and brake clean inside to get the paint off. The paint they used inside on the gear in the differential to set it, isn't breaking down like its supose to contaminating the lsd.

charlietuna 06-04-2013 12:33 AM

Quote:

Originally Posted by CROWN (Post 6625654)
theres a private bulletin for the zl1's. Calls to flush the fluid about 3 times and in between those drive it so many miles doing so many figure 8's and a lot of nonsense, all in all majority of the time they are replacing the whole rear end, and when you get it supose to take apart the cover and brake clean inside to get the paint off. The paint they used inside on the gear in the differential to set it, isn't breaking down like its supose to contaminating the lsd.

Do you have the tsb# ??? :thanks:

ZL1Catfish 06-04-2013 11:16 AM

Im interesyed in thos also. I also notice some sort of loud winning noise espesially in 4yh or 5th gear. Dont recall as im giving it gas.

Al C. 06-04-2013 11:32 AM

Just change the fluid, it will go away! takes 20 mins to do. you have to get the diff fluid with ls additive already in it.

DangerZL1 06-04-2013 12:00 PM

Quote:

Originally Posted by ZL1Catfish (Post 6627252)
Im interesyed in thos also. I also notice some sort of loud winning noise espesially in 4yh or 5th gear. Dont recall as im giving it gas.

May not be related to the fluid issue. Could be improper lash setup in the rear. Changing fluid will not help this problem.

Th3Beast 06-04-2013 12:23 PM

Quote:

Originally Posted by Al C. (Post 6627314)
Just change the fluid, it will go away! takes 20 mins to do. you have to get the diff fluid with ls additive already in it.

When changing the fluid, how do you flush the old fluid out of the lines and cooler going up to the front?

Modern07 06-04-2013 12:34 PM

I had this issue, dealer changed out the fluid and the problem went away.

Al C. 06-04-2013 01:42 PM

Quote:

Originally Posted by Th3Beast (Post 6627557)
When changing the fluid, how do you flush the old fluid out of the lines and cooler going up to the front?


I just drained at the diff, and filled at the upper plug, noise stopped. If you feel draining at the diff is not good enough and want to get the lines and cooler drained, take it to the dealer. Im sure they use some sort of positive feed pump, but i dont think thats needed.

DangerZL1 06-04-2013 04:49 PM

Draining the lines and cooler would have no effect on the noise. The cooler is running transmission fluid and doesn't mix with the rear diff fluid.

Jamesdman24 06-04-2013 10:31 PM

Thanks guys. Sounds like my dealership is changing my fluid!!!

Th3Beast 06-05-2013 07:46 AM

Quote:

Originally Posted by DangerZL1 (Post 6628789)
Draining the lines and cooler would have no effect on the noise. The cooler is running transmission fluid and doesn't mix with the rear diff fluid.

Correct me if I'm wrong, but if there is a feed and return line going from the diff to the front of the car and ran thru a heat exchanger, than there will be old gear fluid in those lines and hx unless flushed.


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