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Old 08-16-2014, 11:43 AM   #15
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Originally Posted by chevi286 View Post
This differential looks like something belonging to Nascar. It's the beefiest rear end I've seen. Means large heavy duty gears, and little insulation on this car. That you'll hear some noise isn't surprising
I hear people say this on here.. frankly it is bs.. It is about the quality of the gear cutting and set up.. big diesels truck gears can be perfectly quite and most are.. not a peep of noise has come out of the last 4. 3/4 ton trucks I have had with bigger ring gears.. With windows down there is no insulation...

My zl1 was a screamer from the rear end. I posted on here as asking on how many others had the same.. got about 85% of the replies from folks defending how it was normal and how I was wanting perfection. . No just had a noisey rear end in my 60k new car..

So any ways I took it to the dealer and had it looked at.. they rebuilt the rear end since there were numerous things wrong with the set up from pre load on the pinion bearings to not enough pinion depth, not enough preload on the carrier bearings.. basically it was like a third grader had originally set it up.. The tech there at maita chevy did a awesome job rebuilding it, took the time to get everything correct with all the new parts and imagine this, it made NO NOISE once he was done and installed it..
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Old 08-16-2014, 12:01 PM   #16
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Quote:
Originally Posted by JackalopeZL1 View Post
I here people say this on here.. frankly it is bs.. It is about the quality of the gear cutting and set up.. big diesels truck gears can be perfectly quite and most are.. not a peep of noise has come out of the last 4. 3/4 ton trucks I have had with bigger ring gears.. With windows down there is no insulation...



My zl1 was a screamer from the rear end. I posted on here as asking on how many others had the same.. got about 85% of the replies from folks defending how it was normal and how I was wanting perfection. . No just had a noisey rear end in my 60k new car..



So any ways I took it to the dealer and had it looked at.. they rebuilt the rear end since there were numerous things wrong with the set up from pre load on the pinion bearings to not enough pinion depth, not enough preload on the carrier bearings.. basically it was like a third grader had originally set it up.. The tech there at maita chevy did a awesome job rebuilding it, took the time to get everything correct with all the new parts and imagine this, it made NO NOISE once he was done and installed it..

I agree with you. Everyone told me the same thing. The tech test drove and said it was definitely not normal. They rebuilt mine too. They mentioned they found a ton of issues like you mentioned which was causing the whine. After the rebuild, no noise whatsoever. Mine was making it almost all the time.

About two weeks later I'm hearing the noise again but it's faint and only during deceleration. They are taking about replacing the rear end this time.
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Old 08-16-2014, 01:07 PM   #17
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We have had threads about this on our forum for more than a while.
A question just came to mind, if some of you are comfortable responding to it:

To both those that have, and to those that that not, had the rear diff noises, did you follow the overall recommended break in procedure closely?

Thank you.
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Old 08-16-2014, 01:11 PM   #18
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No problem responding, Yes, broke mine as per GM's recommendation.. as hard as it was to do.. But frankly with gear setups in general, 3 or 4 heat cycles and 500 miles to wear in you should be good to go..
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Old 08-16-2014, 02:32 PM   #19
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Interesting, I drove three zl1s including mine and all had some level of rear end noise. My previous Boss 302 was even more noticeable. Guess I was just unlucky four times in a row. Hearing noises in a relatively quiet car compared to a diesel truck is apples to oranges. Bottom line, if you're in doubt have the dealer take a look

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Old 08-16-2014, 05:54 PM   #20
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Hope it isn't what i had with my 2010 SS. I have read that other experienced the same thing as well with the rear ends. I had a faint hum that increased all of a sudden one night, and then the car would not move. Dealer said that a seal went out, lost fluid, and ruined the rear end. Luckily it was covered under the warranty.
Completely different rear ends.
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Old 08-16-2014, 06:00 PM   #21
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Quote:
Originally Posted by ZEDL1 View Post
We have had threads about this on our forum for more than a while.
A question just came to mind, if some of you are comfortable responding to it:

To both those that have, and to those that that not, had the rear diff noises, did you follow the overall recommended break in procedure closely?

Thank you.
I have had it in three times, first time back lash was off. They replaced the ring and pinion, no noise. Later I got the noise while turning. They did the TSB, no noise. Several thousand miles later it came back, did the TSB again, no noise since. This rear end is almost bombproof, they did something like 800 hard launches testing it's durability, no problems.
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Old 08-18-2014, 03:48 PM   #22
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Got an update this morning. they were able to duplicate the noise, parts are ordered and its getting replaced.
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Old 08-18-2014, 03:50 PM   #23
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Good luck!
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Old 08-18-2014, 03:51 PM   #24
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Got an update this morning. they were able to duplicate the noise, parts are ordered and its getting replaced.
are they going to replace the whole thing or repair it?
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Old 08-18-2014, 03:53 PM   #25
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are they going to replace the whole thing or repair it?
Replace. It was rebuilt two weeks ago.
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Old 08-19-2014, 10:50 PM   #26
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subscribed to see how many other people have the issue and what happens.

Since NEW....talking 92 miles when I picked it up, it's had the much louder noise on deceleration. I think it usually happens when I take it out of gear and let off the gas....only when out of gear and slowing...
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Old 08-20-2014, 04:41 PM   #27
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Got it back today with new differential. No noises at all other than road noises. Hopefully lasts long. Was told to break it in for at least 500 miles.


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Old 08-20-2014, 04:50 PM   #28
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Aww... issues with the mighty ZL1? Only noise I hear in my SS is the sweet note from my headers and 3" exhaust.



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