11-21-2018, 02:03 PM | #1 | |
Drives: 2018 ZL1 1LE Join Date: Apr 2018
Location: SoCal
Posts: 134
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Rear End whirring on decel...
Anyone here have their rear differential replaced for whirring on deceleration? This is usually indicative of a bad ring/pinion lash or bad bearing. Im curious as to how GM handled it. Did they replace the diff entirely or did they replace the bearing?
My 2018 ZL1 1LE has 11,300 but I do have mods like CAM, headers etc so I fully expect them to try and not cover the rear end, even though the car has only been tracked twice and never even attempted a launch since we all know the M6 cant launch anyway. Thoughts? Here is a link to the sound. |
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11-21-2018, 08:16 PM | #2 |
Drives: ZL1/335i Join Date: Apr 2014
Location: Santa Barbara
Posts: 870
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Damn, that sounds pretty annoying. Not that it really matters now, but have you changed the diff fluid at all?
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11-21-2018, 08:30 PM | #3 |
Drives: 2018 ZL1 1LE Join Date: Apr 2018
Location: SoCal
Posts: 134
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It was serviced at 1500 miles per the recommendation. Past that it hadn’t been changed. The diff actually doesn’t make any noise at all until the fluid warms up so I’m going to drain and fill the diff in the next day or so and see what happens.
I don’t launch the car at all and rarely do any straight lines pulls of any significance so I don’t know how the pinion preload could have loosened, which is usually what this noise is |
11-23-2018, 12:31 AM | #4 |
Drives: . Join Date: Jan 2013
Location: Southern California
Posts: 467
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That's pretty loud. I would get it looked at. I don't think new fluid will do much for that.
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11-23-2018, 09:57 AM | #5 | |
Drives: ZL1/335i Join Date: Apr 2014
Location: Santa Barbara
Posts: 870
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Quote:
That reminds me that I should probably do mine again soon. Like you, I’m modified and likely on my own for many warranty issues. I’ve always seen fluid changes as cheap insurance. Not saying that would have prevented this. Could just be a fluke failure. |
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11-23-2018, 10:17 AM | #6 |
Oh Oh it's Friday Night!
Drives: 2018 ZL1 1LE Nightfall Gray Join Date: Jan 2018
Location: Walton Woods
Posts: 1,064
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Once the whine gets to that point for any length of time, fluid change will not fix anything. Need to see the dealer.
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2018 Camaro ZL1 1LE NFG; ARH 2” headers, catless mids, ARH full exhaust, Lingenfelter 18% lower pulley, ATI Harmonic Balancer, Roto-fab CAI, EE-catch can, TM ported TB, NX Lid, BMR strut tower brace. Aeroforce dual pod interceptor gauges. Tuned by Vengeance Racing!!! 644 HP @ 6250 rpm / 689 trq @ 3660 rpm
Four that wanna own me Two that wanna stone me One says she's a friend of mine... |
11-23-2018, 01:33 PM | #7 |
Drives: ZL1/335i Join Date: Apr 2014
Location: Santa Barbara
Posts: 870
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If that was directed at me, that wasn’t at all what I was implying. Just wonder if preventative maintenance might have stopped this from happening.
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11-23-2018, 07:01 PM | #8 |
Drives: 2018 ZL1 1LE Join Date: Apr 2018
Location: SoCal
Posts: 134
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I’m planning to see the dealer. My post wasn’t about whether or not it could be saved. I was asking what people’s experience with drivetrain warranty with modified engines. I’m sure they will fight me but just wanted to see what others had experienced.
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11-23-2018, 11:31 PM | #9 |
Oh Oh it's Friday Night!
Drives: 2018 ZL1 1LE Nightfall Gray Join Date: Jan 2018
Location: Walton Woods
Posts: 1,064
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Hard to say, very dealer specific. I come from a long line of Chevy dealers in my family. Warranty work can be a money loser for dealers as GM will not always fully reimburse the dealer for his cost of warranty service. I could easily see and in fact have personal knowledge of one dealer denying warranty work on a noisy rear end on a Corvette with a mildly modified engine. Then it can become an expensive pissing contest with dealer about proof that the modifications caused the failure. So, although I know of only one example, it is a realistic possibility they may fight you. Insist on specific proof that the mods caused the rearend failure. You might want to ask around about which dealers in your area are more mod friendly, if any.
__________________
2018 Camaro ZL1 1LE NFG; ARH 2” headers, catless mids, ARH full exhaust, Lingenfelter 18% lower pulley, ATI Harmonic Balancer, Roto-fab CAI, EE-catch can, TM ported TB, NX Lid, BMR strut tower brace. Aeroforce dual pod interceptor gauges. Tuned by Vengeance Racing!!! 644 HP @ 6250 rpm / 689 trq @ 3660 rpm
Four that wanna own me Two that wanna stone me One says she's a friend of mine... |
11-23-2018, 11:55 PM | #10 |
Drives: 2018 ZL1 1LE Join Date: Apr 2018
Location: SoCal
Posts: 134
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I’ve got some feelers out from my builder to try and get this handled. If I’m out of pocket it will be about $3k, at which time we will probably do a 9” or something better
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11-24-2018, 09:51 AM | #11 | |
Drives: ZL1/335i Join Date: Apr 2014
Location: Santa Barbara
Posts: 870
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Quote:
By the way, do you happen to know a Porsche/McLaren tech named Dave? |
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11-24-2018, 11:30 AM | #12 |
Drives: . Join Date: Jan 2013
Location: Southern California
Posts: 467
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Problem is you are putting more power to the rear end than what it was designed and tested for. That certainly would be grounds for warranty denial.
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11-24-2018, 11:41 AM | #13 |
Drives: 2018 ZL1 1LE Join Date: Apr 2018
Location: SoCal
Posts: 134
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The rear end is built for way more power and yes, I’m aware of what their position will be.
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08-13-2023, 08:05 AM | #14 |
RedLine
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What was the fix? I have the exact same noise coming from my 2022
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