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Coupes & Convertibles Chevrolet Corvette Chevrolet Corvette Transmission Problems
90 messages, Last post on Oct 26, 2009 at 8:05 PM
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Help! I bought a beuatiful blue 2008 Vette with the optional titainium exuast, and auto tranny. I notice a grinding sound coming from the rear of the car at around 3000 RPM if I give it slight acceleration in 1st or second. In thrid however, that sound starts at 2500 RPM, and 4th 5th and 6th it starts at 2000 RPM. Again, I can only notice the sound under some acceleration. I took it to my local dealership where I bought it. I got mixed reactions. The head mechanic says he thinks it's muffler resin (where I have I heard that before?), which seems to be a conviniant way to explain it away. But I know better...this sound is more serious than that. And resin wouldn't act like that at those RPMs. But wait, it get's better... The salsmen went for a ride and after hearing it claimed that it is a combination of 4 things! He says it is stiff sidewall EMT tires when I accelerate, plus "power transfer" to the rear, plus "lug noise" (for the higher gears), plus some muffler resin! Wow, with those four things working together at once, ANYTHING can be explained away! Problem is the dealership that I bought it from has NO CORVETTE EXPERTS. In fact, they even admit they never have even tore into a C-6 before! I think I will need a new tranny (I hate that), but I'm not sure. What should I do? Drive around from dealer to dealer until I happen to come accross someone who knows what they are doing? Or do I just demand that my dealership honor the warenty and replace the tranny? Or mabey it's not the tranny, but I'm just missing something? I don't know what to do...any help is appreciated thanks.
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Sorry for the double post, but if anybody is reading this, an update: I just drove it with compotition mode off, and it still makes that grinding sound. Same with traction control off. At this point, I'm also worried about the rear axle. Could it be low on fluid? But if that were the case, wouldn't it make that "sound" all of the time, and not just at certain RPM's? Am I going nuts? I cannot accpet the generic "well, the sound is probably normal", espicially since I just spent some 55,000 bucks on this car! Ok here is my plan...Monday I will make an apointment and have the dealership put it up on a rack, and check the underside for anything loose...like a muffler bolt or whatever. While up there, I will have them flush the rear-end fluid (which they will probably suggest anyway), and then drive it and see. If the sound continues after that, I will ask them to replace the transmission. Anyway, that's my plan. Anyone else have any ideas?
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Replying to: tmerriss (Nov 10, 2007 7:11 am) My only suggestion is that ( given what you say above regarding the [ lack of ] Corvette expertise in servicing C6s ) is immediately cancel your appointment with this dealer & start talking with other dealers - and take your C6 to one with Corvette tech(s). My $0.02 worth... - Ray Bought local, but from a dealer with 2 techs that ONLY work on Corvettes... |
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Replying to: tmerriss (Nov 10, 2007 5:28 am) I think some of your speeds are strange. At 2000 rpm in 6th, you would be doing what, 90+mph? Can you really hear a minor rear end noise at that speed. Overall, my recommendation would be just drive the car until the noise is something that can't be ignored and can easily heard by the service rep or mechanic. After all, these thing are under warranty, and it has a 100,000 mile driveline warranty. And, after a few chips and scratches, you will feel better about leaving it at a dealer for a few days while they tear out and replace the ring and pinion gears. |
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Replying to: tmerriss (Nov 10, 2007 5:28 am) |
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I will ask about the regional service rep, but like you, I hold out little hope that anyone will know what it is. There is no service bulliten out on it for this problem. I still think that a basic look under it and checking for anything loose, plus a fresh flush of the rear end is the way to go. But I will also try this regional service manager. Of course, the noise/feel being there is driving me nuts. I keep going out for a test drive, holding out false hope that I will somehow figure it out this time! It's like I'm helpless so I resort over and over to the only thing I can do on a weekend...keep test driving it. And yeah, I'm not looking forward to the dealership getting it up on a rack. A few years ago I had my C-5 in a few times, and the first time I got it back with a few new scratchs on it. 2nd time it was fingerprints. The 3rd time they actually wrecked the car pulling it out of the bay! I noticed it when I was getting in the car...they didn't even know they wrecked it! I'll tell you this, when the car is in bay...so will I be! I'm going to be in there watching everything. Every dealer should have a Corvette pro. This is ridiculous. |
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BTW, not only can I hear it, I can feel it too. And after this mornings test drive, I notice bolivar is right about the RPM at the higher gears (5th and 6th). It was happening at the 2000 RPM at 3rd and 4th, so when I heard it in 5th and 6th, I wasnt even looking at the RPM gauge and ASSUMED (not thinking) it was at 2000 RPM...but in those two gears it is much lower RPM then 2000-2,500 range when the sound.vibration begins. Again, I'm not talking just about heavy acceleration here, I'm talking about LIGHT acceleration. And once the noise starts, it stays with me as the RPM's grow. No way "muffler resin" explains this away. This happens before the butterflies open up on my titainium exaust (they open about 3,000 RPM). Also I agree it seems more a rear-end differential issue which makes the most sense. But what about the tranny? It's back there too. I don't know how it is set up back there, but are there U joints back there too? This is a nightmare |
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Replying to: tmerriss (Nov 11, 2007 6:18 am) So it looks like Ray is right-on with his idea of calling around to different dealerships, which it looks like I'll have to do anyway. It's either that, or let the monkeys at my dealership tinker with the unknown (to them) C-6...and I just don''t feel comfortable with that scenario. I'll report back when I know more....
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Replying to: tmerriss (Nov 12, 2007 12:54 pm)
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