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

Jamesdman24 06-02-2013 11:28 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 05:13 AM

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

Rizzo 06-03-2013 09:00 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 11:49 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 01:33 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 12:16 PM

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 12:32 PM

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 01:00 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 01:23 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 01:34 PM

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

Al C. 06-04-2013 02:42 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 05:49 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 11:31 PM

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

Th3Beast 06-05-2013 08:46 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.

CAM....ZL1 06-05-2013 09:06 AM

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.



My fluid was changed by the dealership, and when i turn left or right
at about 5mph i hear a whine or humm.

DangerZL1 06-05-2013 11:43 AM

Quote:

Originally Posted by Th3Beast (Post 6631501)
Correct me if I'm wrong.

Ok :biggrin:

From Chevy's site:

The differential cooler is a truly unique design. This innovative system pumps overcooled transmission fluid to a heat exchanger inside the housing, removing excess heat from the differential fluid

Sven59 06-05-2013 11:53 AM

I had the same issue, back to the dealer twice, first time the backlash was off, replace ring and pinion, noise went away but came back. Next time they flushed the rearend very good. They think some of the left over lashing compund was causing the whine. It has been quiet ever since and that was about 10,000 miles ago.

Th3Beast 06-05-2013 04:20 PM

Quote:

Originally Posted by DangerZL1 (Post 6632024)
Ok :biggrin:

From Chevy's site:

The differential cooler is a truly unique design. This innovative system pumps overcooled transmission fluid to a heat exchanger inside the housing, removing excess heat from the differential fluid

Wait a minute... I'm a little confused on that. So the differential fluid is not getting pumped to the front of the car?

ZL1Dave 06-05-2013 05:09 PM

Quote:

Originally Posted by Th3Beast (Post 6633249)
Wait a minute... I'm a little confused on that. So the differential fluid is not getting pumped to the front of the car?

Correct...its trans fluid that goes back to the rear diff and picks up some heat off the center section and housing

DangerZL1 06-05-2013 05:11 PM

No. ATF is the meduim used for cooling. Otherwise the system would take more than around 2 qts of fluid to do a rear differential fluid service. I also wonder how well gear oil would circulate, especially compared to a thinner trans fluid.

DRTH VDR 06-14-2013 11:05 PM

http://www.camaro5.com/forums/showpo...3&postcount=45 :cool:

BigguyBri 07-09-2014 01:08 PM

My 2013 ZL1 is in the shop now. They drained and flushed the differential 3 times but the noise is still there. I was told they're contacting Detroit to see what the next step is. They've had it for 3 days now. I really miss my ride.

DRTH VDR 07-09-2014 06:18 PM

Quote:

Originally Posted by BigguyBri (Post 7804352)
My 2013 ZL1 is in the shop now. They drained and flushed the differential 3 times but the noise is still there. I was told they're contacting Detroit to see what the next step is. They've had it for 3 days now. I really miss my ride.

Make sure that your ZL1 was driven for 20 miles between each differential fluid change. My dealer doesn't take my ride off the lot unless I'm aboard, so I put the 60 miles on it and the problem cleared.

Cheers - :nod: Major Boyd

Camero5 07-21-2014 03:26 AM

Quote:

Originally Posted by Jamesdman24 (Post 6621171)
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!!!

Does it happen while at a cruising speed as well?

My 2013 was doing it on turns and it was noticeable at cursing speeds. When I acc/dec it would go away but while maintaining a speed I could hear it.

Took it to the dealer and they rebuilt the rear end. I've heard of others getting a new rear end for the same issue.


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