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Coupes & Convertibles Chevrolet Corvette Chevrolet C6 Corvette
914 messages, Last post on Aug 30, 2008 at 6:54 PM
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Replying to: billmlb (Apr 28, 2008 9:54 am) The second one sounds like the ABS system initializing.
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Replying to: fedlawman (Apr 28, 2008 12:54 pm)
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Replying to: coupedncal (Apr 28, 2008 1:07 pm) I don't drive mine very often, and get lifter noise for a couple of seconds after startup. And I don't worry about it.
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Replying to: bolivar (Apr 29, 2008 7:00 pm) Thanks for taking the time to reply! I don't drive my car very often either and you may be right! BillMLB |
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My '07 C6 6sp auto coupe now has 3500 miles on the odo. Recently I have noticed a "grinding" noise coming from somewhere in the rear while slowly turning in either direction. This only happens when I first start driving the car and the engine oil, etc. is still cold. Once I drive for 10 miles or so, the noise goes away. I seem to remember reading about some similar posts describing similar noises, but I can't find them at the moment. I haven't taken it to the dealer yet. I plan to address it with them at the time of the first oil change later this summer, unless this is a problem that requires more immediate attention. Does this sound like a problem developing within the rear differential ? Is there a TSB describing such a noise ? What's the fix ?
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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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