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914 messages, Last post on Aug 30, 2008 at 6:54 PM
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Replying to: toydriver1 (Jun 07, 2008 7:34 pm) IF turning, it's probably a noisy rear differential. Chevy limited slip differentials have made noise for many, many years. The noise in the Corvettes seems to become worse, from what I've read, over the last few years. Chevy have been changing the fluid and additive over the last couple of years to find something that will resist the noise. They have again come out with a new fluid in the last few months, which seems to be helping many people. If you dealer has sold many Corvettes, the service department should be well aware of noisy rear diffs. They have TSBs to look at which should give them the newest fluid to use. A noisy diff does not harm much. As you drive the car, and do not make many sharp turns, the lubricating fluid is forced out of the friction plates in the diff. The dry plates then make noise when the car is turned sharply. If you would take the car to any empty lot and drive in tight circles or figure 8's for about 8 loops, you will open up the plates and fluid will get in there and the noise will stop. For a while at least.
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Replying to: bolivar (Jun 08, 2008 10:39 pm) ONLY while turning sharply. For example, turning into a parking spot or backing onto the street from my driveway. ONLY when steering wheel fully "cranked" to either side. NO noise when driving in a straight line. I haven't driven the car aggressively. Mostly, a weekend cruiser and summer evening driving with the wife. Typically the only "sharp" turns are at less than 15mph. The dealer where the service will be performed is different than where I purchased the car, but they do have the most experience in our metro area ( typically have 5 to 10 new vettes and 3 or 4 used ones on their lot at any given time). So, taking your advice I will assume that they know how to check for TSBs and will be willing to change the fluid, since it is under warranty. Thanks for your advice. I'll try the "tight circles in a parking lot" routine and see if that helps too.
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Replying to: toydriver1 (Jun 09, 2008 6:09 pm) front tire noise..... Because of the alignment and the super wide tires, a C6 Corvette turned at full lock, moving slowly, will actually scrub (slide) the front tires. And you will be able to hear this. Completely normal, nothing to worry about, and nothing can or should be done about this.
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Replying to: bolivar (Jun 10, 2008 1:09 am) I think you were "spot on" when you described the situation with the limited slip diff. I'll report back after a few "tight circles" in the parking lot and see if that temporarily cures the noise. thanks again for your input. |
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Bolivar: After several "figure 8s" in a local parking lot, the noise went away..............................until it was parked for a few days. Then I heard the same thing when pulling into a parking spot. Low pitch grind like metal components rubbing. Again, I don't hear it after the car warms up and I don't hear it when cornering at speeds over 30 mph or so. I found reference to the TSB about "rear differential noise" in the Edmund's service link for my '07 C6. I'll need lube service within the next month so I'll have the dealer address the noise at that time. Hopefully they'll put some new and improved lubricant in the differential reservoir. Thanks for your help. |
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I purchased my first Corvette, a new 2006 on May 30, 2007. The car now has 2380 miles. Unfortunately for me I've spend the last 4 months overseas and the 12 month period everyone seems to be referring to has obviously passed. I assume now that I am only eligible to purchase an "aftermarket" extended warranty and not GMPP. Since this is my weekend driver and plan on putting no more than 5000 miles a year, the length not the mileage is more important to me. If I am not eligible for GMPP does anyone know of or can suggest which company offers the best plans/prices? Any help or suggestions would be greatly appreciated
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Replying to: ybpoor (Jul 03, 2008 11:40 pm) Most/many dealers will offer it. They will want to sell you some aftermarket warranty, probably because they make more money on this. But the GMPP will probably cost more. If a Chevy dealer does not offer the GMPP, go to another one. |
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Replying to: ybpoor (Jul 03, 2008 11:40 pm) just at a higher price than if purchased before 12\12... You can buy this at any dealership - and some specialize. I saved hundreds buying this way... Good luck! - Ray Drove over 2300 miles in less than the first 2 months in my [ DD ] Corvette... |
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I previously mentioned that my '07 C6 with 4.5K miles had developed a noise in the rear while driving slowly and making tight turns. Apparently, Vettes are known for noisey rear differentials. I had lube service done today and while at the dealer they replaced the rear differential fluid with something "new" from GM" and described in a technical service bulletin ( listed on Edmunds ). The service writer seemed familiar with the problem but was typically hesitant to give "too many" details. This fixed the problem and the car now drives like it did when it was new. I hope this new lubricant continues to solve the "problem". Thanks for the assistance in describing the problem and the "fix". |
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2008 Coupe, the left rear wheel well does not fit well to the body, you can actually slide your fingers between the edge of the wheel well black liner and the exterior quarter panel. The dealer says there is no correction. Any suggestions?
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