Rear noise
Thread Starter
Heel & Toe
Joined: Aug 2003
Posts: 18
Likes: 0
From: Blairsville GA
Rear noise
My 1999 Coupe has recently developed a noise in the rear. It sounds like it is on the passenger side. It is a clicking or scrapping sound. It is definetely related to the speed of the car. It seems worse when I go around a corner, then gets quieter when I straighten out. At first I thought it may be the brakes, so I changed the rear pads since I have never changed them yet and I have 111K miles on the car. The old pads were only about 25 to 30 % worn. The other thoughts that come to mind are the CVS joint on the rear axle. The parking brake that I hardly ever use or the differential. Looking at it, I can not see anything that looks like it could be scrapping or leaking. I thought maybe someone out there has had a similar experience and would like to share their experience with a solution that I maybe able to tackle.
Le Mans Master
Joined: Apr 2002
Posts: 6,927
Likes: 3
From: Glendale NY
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18- '19
Thread Starter
Heel & Toe
Joined: Aug 2003
Posts: 18
Likes: 0
From: Blairsville GA
That is a reasonable thought. Do you think it would make it quieter? Perhaps I should just take it to a dealer and see what they think{dread the thought}. I am just concerned if I keep driving it would cause more damage.
Last edited by VetteLuvr987; Dec 3, 2007 at 09:09 PM. Reason: extra character
Pro
Joined: Sep 2003
Posts: 731
Likes: 0
From: Calgary Alberta
Sounds like your axle splines need some lube and retorquing.
Pull thew rear wheels off and look at your axle splines; if they are rusty, back off your axle nuts, spray on some lube, and retorque the nuts.
The axle splines typically make a clicking noise when they are loose.
Pull thew rear wheels off and look at your axle splines; if they are rusty, back off your axle nuts, spray on some lube, and retorque the nuts.
The axle splines typically make a clicking noise when they are loose.
Melting Slicks
Joined: Feb 2006
Posts: 2,172
Likes: 104
From: Des Moines Iowa
Sounds like your axle splines need some lube and retorquing.
Pull thew rear wheels off and look at your axle splines; if they are rusty, back off your axle nuts, spray on some lube, and retorque the nuts.
The axle splines typically make a clicking noise when they are loose.
Pull thew rear wheels off and look at your axle splines; if they are rusty, back off your axle nuts, spray on some lube, and retorque the nuts.
The axle splines typically make a clicking noise when they are loose.
Also agree that @ 111,000 miles you are way past due to change out rear end fluild if you've not done so recently.
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Racer
Joined: Sep 2006
Posts: 280
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Price can vary by dealer - mine charges $89.95 + tax, etc.
Thread Starter
Heel & Toe
Joined: Aug 2003
Posts: 18
Likes: 0
From: Blairsville GA
rear noise
Well I changed the differential fluid and additive today. I drove it about 10 miles afterwards. For the most part I did not hear any noise, although on my way home I did hear the sound once and it was right after going around some curves. If it is the limit slip sticking, I wonder how long it will take to free up? I also looked the the axle and it is almost like new. Here in Georgia, we just don't have as much of a rust problem. I do really appreciate all of the input all of you have provided. My neighbor retired from GM and he also felt that it was most likely the differential fluids and has experienced a similar situation.
Drifting
Joined: Oct 2004
Posts: 1,345
Likes: 3
From: Mesa Arizona
Well I changed the differential fluid and additive today. I drove it about 10 miles afterwards. For the most part I did not hear any noise, although on my way home I did hear the sound once and it was right after going around some curves. If it is the limit slip sticking, I wonder how long it will take to free up? I also looked the the axle and it is almost like new. Here in Georgia, we just don't have as much of a rust problem. I do really appreciate all of the input all of you have provided. My neighbor retired from GM and he also felt that it was most likely the differential fluids and has experienced a similar situation.
Racer
Joined: Aug 2007
Posts: 401
Likes: 1
From: Ashburn, VA
Check your parking brake cable to make sure it's not rubbing the tire. This was the case for one of my friends. He was worried he had some major mechanical problem, but it turned out the parking brake cable was rubbing the inside of the wheel/tire.
Thread Starter
Heel & Toe
Joined: Aug 2003
Posts: 18
Likes: 0
From: Blairsville GA
rear noise cont.
Drove about 50 miles yesterday and the clicking/scraping sound still comes and goes. I pulled the rotor and checked the parking brake for anything loose in there. It is a little worn but still looks good enough to function properly. Another thought is the wheel bearings. My past experience with wheel bearings is that they tend to make noise all the time when they are going bad. Fourtunely I have my Z06 to drive or my truck. As you can tell, I am reluctant to take it to the dealer. I will let you all know when I finally get it solved.
Drifting
Joined: Jan 2000
Posts: 1,660
Likes: 9
From: Charlotte, NC
What you're describing sounds a lot like the differential problem that you've already treated. The thing to do now is to drive into a parking lot and do a few sharp left circles and then sharp right circles. You steering wheel should be completely turned in one direction while performing these circles. This should help get the new fluid in into the differential crevices.
Also, are you certain that the differential additive was used when they changed your fluid? If they didn't use the additive, then you will see no improvement in the sound and it will most likely get worse.
Also, are you certain that the differential additive was used when they changed your fluid? If they didn't use the additive, then you will see no improvement in the sound and it will most likely get worse.
Thread Starter
Heel & Toe
Joined: Aug 2003
Posts: 18
Likes: 0
From: Blairsville GA
rear noise solved
I pulled the calipers and rotor yesterday. I tried to clean the parking brake area as best I could. Today when I drove it, NO NOISE!!! The only thing I could figure is that the Parking brake pads were offset a little or there was some trash stuck up in there. 
