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Old 04-09-2012, 06:18 PM   #1
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ZL1 Rear Differential Failure!

I was supposed to pick up my 2012 Ashen Gray ZL1 at my dealership today at 5pm after PDI. As part of the PDI, a technician who I respect, took the car for a short test drive to make sure everything was perfect. I got a call from my service manager saying that the rear end is bad and whining distinctively at low speeds. They have ordered a whole new rear end to be Fed-exed tomorrow and hopefully installed by tomorrow night.

Of course I am really upset and want to get your opinions on what this really means since I am not a technician. Will the car be the same after a complete rear end replacement? Does this mean I have received a lemon? Was this an assembly line error or was it just a defective major part? By the way, it sat in QC for 4 weeks with the others.
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Old 04-09-2012, 06:20 PM   #2
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You will be fine. It could have been a defective part or even a bolt or something wasn't torqued. It makes you wonder if any others will have issues. It will technically be better than new
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Old 04-09-2012, 06:21 PM   #3
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Nothing to be worried about. Parts are bad sometimes.
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Old 04-09-2012, 06:22 PM   #4
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I would not worry they will take care of you. I had a tremec speed got out at 170miles in my 08 C6.

granted it sucks cause you want the car right now I am sure.
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Old 04-09-2012, 06:25 PM   #5
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What really happened is the tech had so much fun in your car he got carried away with it and in turn now you need a new rearend
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Old 04-09-2012, 06:26 PM   #6
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What really happened is the tech had so much fun in your car he got carried away with it and in turn now you need a new rearend
I was thinking the same thing, but these rearends are supposed to be indestructable. Probably just a rare bad part.
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Old 04-09-2012, 06:29 PM   #7
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What really happened is the tech had so much fun in your car he got carried away with it and in turn now you need a new rearend
First thing that crossed my mind as well. Check out the rear quarters for stone nicks.
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Old 04-09-2012, 06:49 PM   #8
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Did they check the rear differential fluid level?
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Old 04-09-2012, 06:51 PM   #9
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I was thinking the same thing, but these rearends are supposed to be indestructable. Probably just a rare bad part.
at the hands of the wrong person, nothing is "indestructible."
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Old 04-09-2012, 07:33 PM   #10
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at the hands of the wrong person, nothing is "indestructible."
BINGO!

I wouldn't jump to conclusions. At least they caught it now rather than after you already had your car. You'd be even more unhappy.
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Old 04-09-2012, 07:36 PM   #11
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Just saying with all the tests we've seen it would be extremely hard to break a brand new differential that is in perfect working order (properly filled with correct fluid).
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Old 04-09-2012, 08:45 PM   #12
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I'm with most everyone else. I wouldn't sweat it, these things happen, I know it's not as large of a part, but I had to get my battery replaced under warranty on my 2010 SS when it only had a few thousand miles on it. Never had a problem other than that in the 2 yrs I had it.
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Old 04-09-2012, 09:16 PM   #13
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At least it sounds like they are on it quick. Are they replacing the entire rear end or just the gears?
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Old 04-09-2012, 09:19 PM   #14
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mcamisgroup, I'm sorry to see this happen to such a new vehicle. Glad to see the dealer is on top of things and I hope you can enjoy your ZL1 from here on out. Let us know how things go for you.

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Old 04-09-2012, 09:21 PM   #15
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It's better that happened before you take delivery so you get it already fixed.
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Old 04-09-2012, 09:32 PM   #16
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Car is totally screwed up. Good thing I will take it off your hands for a small fee.
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Old 04-09-2012, 09:39 PM   #17
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You will be fine I am in manufacturing and you know what i tell my customers. NEW stands for Never Ever Worked. New things fail and they usually fail out of the box or never. Thats why everyone wants to sell extended warranties.
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Old 04-09-2012, 09:43 PM   #18
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See if you can get some!
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Old 04-09-2012, 09:49 PM   #19
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I wouldn't worry about it because even new things from the factory break sometimes. You should ask the tech what his 1/4 mile time was.
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Old 04-09-2012, 09:56 PM   #20
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I guess there was a reason they called drag racing legend Grumpy Jenkins grumpy. He had trouble in the beginning too. Sorry for taking this thread in his direction, but he just died recently and the rear end trouble posted by the OP, just made me feel "grumpy" which then led me to think of Grumpy Jenkins!

I see he just recently passed away. He was one of the big ones who made the most of Chevy muscle cars! Let us know what happens with your car, but while you're passing time, check out the interesting facts of how Grumpy made a 327 small block outrun the big block 426 hemi's and more!

http://en.wikipedia.org/wiki/Bill_Jenkins_(drag_racer)
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Old 04-09-2012, 10:01 PM   #21
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It's probably nothing, but it MIGHT be abuse. If you brought a new car back to them because the rear end was whining, they would likely investigate for abuse too. Trust but verify.
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Old 04-09-2012, 10:05 PM   #22
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Thanks to all who have responded. I have been very verklempt and bummed out wanting to get my baby home to her spa. Your responses have made me feel like maybe this isn't such a big deal. My dealership has always been great and I'm grateful they let me know about this rather than me finding out after delivery. They assure me the whole rear end will be replaced as opposed to just the gears.
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Old 04-09-2012, 10:18 PM   #23
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Thanks to all who have responded. I have been very verklempt and bummed out wanting to get my baby home to her spa. Your responses have made me feel like maybe this isn't such a big deal. My dealership has always been great and I'm grateful they let me know about this rather than me finding out after delivery. They assure me the whole rear end will be replaced as opposed to just the gears.
I live around the Williamsburg area did you order from Holiday Chevy?
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Old 04-09-2012, 10:25 PM   #24
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So what you're saying is that your rear-end was screwed?? Not enough smilies in the world to compensate for that one....

Sorry dude...GM will take care of you AND replace your rear end as good as new... LOL!
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Old 04-09-2012, 10:33 PM   #25
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Rear end is a quick swap you should be rolling in no time. Good that they noticed it...

Also try and find out EXACTLY what the issue was...
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