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 3Likes
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1
Post By patrickt
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2
Post By ACademic
09-03-2019, 01:48 PM
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CC Member
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Join Date: Jan 2005
Location: Orange,
CT
Cobra Make, Engine: ERA #720
Posts: 117
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Not Ranked
Clunking noise
I noticed about a week ago I was hearing (and feeling) a bit of a clunking noise when getting on or off the gas. So this Saturday I spent a couple hours under the car inspecting everything from front to back, motor mounts, tranny mount, u-joints, brakes, e-brake, etc. Everything looked good, couldn't find a single thing out of place. So then Monday I took the panel off behind the seats for a different perspective and still found nothing.
After all of this I put the car in gear and rocked it back and fourth and when I do that I can hear the noise. It seems to be coming from the drivers side rear wheel area but I can't pinpoint it. If I'm in the car it sounds like its coming from the wheel, if I'm outside the car (near the wheel) it sounds like its coming from closer to the center of the car. I'm inclined to thing its closer to the wheel because with that panel off I think it would be obvious if it were in or near the differential. Anybody have any suggestions?
Eric
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09-03-2019, 02:16 PM
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CC Member
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Join Date: Dec 2000
Location: Livermore,
CA
Cobra Make, Engine: ERA #629, BBM Side Oiler Block, 482ci, Richmond 5 speed
Posts: 851
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Not Ranked
Possibly a you-joint in the half shaft?
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09-03-2019, 03:09 PM
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CC Member
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Join Date: Nov 2007
Location: Clayton,
IN
Cobra Make, Engine: ERA 838
Posts: 1,066
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Not Ranked
What CJ428CJ said. Pull the half shaft and install new universal joints.
John
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09-03-2019, 03:47 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
Quote:
Originally Posted by rads42
After all of this I put the car in gear and rocked it back and fourth and when I do that I can hear the noise. It seems to be coming from the drivers side rear wheel area but I can't pinpoint it. If I'm in the car it sounds like its coming from the wheel, if I'm outside the car (near the wheel) it sounds like its coming from closer to the center of the car. I'm inclined to thing its closer to the wheel because with that panel off I think it would be obvious if it were in or near the differential. Anybody have any suggestions?
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It can only be a couple of things, unless something is loose and you didn't spot it, so the only advice I'll throw in is not to be buffaloed by the sound of the trap doors that flap in the gas tank when you push the car back and forth.  Assuming that's not it, put your car up on 2 x 10's and get under the car while someone else does the shoving. Don't just listen, but actually put your hands on the half shaft u-joints, the differential, and drive shaft u-joints, everything. If there is something misbehaving, you can feel it in your hands when you hear the ker-chunk. Just make sure your buddy doesn't push the car off the ends of the planks on to your chest. That will make for a very bad day.  But I wouldn't even think about yanking a half shaft out until I was damn sure I knew what the problem was. |
09-03-2019, 04:33 PM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,773
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Not Ranked
Quote:
Originally Posted by CJ428CJ
Possibly a you-joint in the half shaft?
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Yes, could be.
But the correct spelling is U-Joint, short for Universal joint.
The OPs description sounds more than a universal joint, if it is a u-joint then it should be obvious.
Gary |
09-03-2019, 04:33 PM
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CC Member
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Join Date: Oct 2010
Cobra Make, Engine: Superformance
Posts: 663
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Not Ranked
I would recommend pulling the rear wheels and check for play in the upper and lower control arms.
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09-03-2019, 04:39 PM
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CC Member
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Join Date: Sep 2001
Location: Danville,
CA
Cobra Make, Engine: CSX 6079 482CI CSX cross ram
Posts: 1,354
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Not Ranked
sounds like rear diff to me... ask me how I know this :-(
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09-04-2019, 05:54 AM
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CC Member
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Join Date: Jan 2005
Location: Orange,
CT
Cobra Make, Engine: ERA #720
Posts: 117
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Not Ranked
I certainly hope you're wrong ERA626. I never beat on this car like dropping the clutch or anything. The most I do is get it rolling and then get on it. the motor is a 428 but it's nothing crazy from a horsepower standpoint so I'd be surprised if the diff was hurt. I'd even be surprised if a u-joint was hurt. The car only has about 6,000 miles on it. I'll get a wheel off this weekend and see if I can find anything. Thanks for the opinions and input, they're much appreciated.
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09-04-2019, 06:58 AM
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CC Member
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Join Date: Jan 2008
Location: Celebration,
FL
Cobra Make, Engine: Superformance #2144 with a Roush 342R (sold June 2018, but still lurking on Club Cobra)
Posts: 128
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Not Ranked
Have you checked the shocks? I had a similar issue and it turned out to be a loose bolt holding the shock.
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