I'm new to this site. I own a 03 Cobra and need help solving the problem of a humming noise coming from the rear of my car when driving. I'm not sure but I think a similar post was placed by 'Blueovalboy' and 'Mk028" chimmed in with the answer. If anyone knows how to solve this problem please help. I've even considered trading the car. This humming soud isn't coming from the tires. I just bought new tires because I thought it might solve the problem. The noise it even louder under load ( when I step on the gas). iI love my car but will trade to escape the noise.
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Thread: Weird Noise
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03-17-08, 12:23 PM #1Junior Member
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Weird Noise
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03-17-08, 01:17 PM #2Administrator
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Does it still have the IRS?
Originally Posted by Blacksnake
I'm new to this site. I own a 03 Cobra and need help solving the problem of a humming noise coming from the rear of my car when driving. I'm not sure but I think a similar post was placed by 'Blueovalboy' and 'Mk028" chimmed in with the answer. If anyone knows how to solve this problem please help. I've even considered trading the car. This humming soud isn't coming from the tires. I just bought new tires because I thought it might solve the problem. The noise it even louder under load ( when I step on the gas). iI love my car but will trade to escape the noise.
Does it get worse with speed?Sold
2004 Cobra, Whipple ,TH-400
Burning Corn
9.97 - 135.5
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03-17-08, 01:32 PM #3Senior Member
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My 8.8 is making a ''humming" noise too. Dont know if one of the rear pads is rubbing the rotor or a axel bearing is going out. Gets really bad when I turn right.
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03-17-08, 03:43 PM #4Senior Member
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had the same thing in my 98 gt, ended up being a carrier bearing for the diff...
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03-17-08, 04:40 PM #5Junior Member
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BurnTire,Yes the car still has the IRS. Stock car, no mods yet. Gets worse with speed.
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03-17-08, 04:41 PM #6Junior Member
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Blueovalboy and Mk028 might have the answer. Anyone know how to erach them?
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03-17-08, 04:47 PM #7Administrator
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Sounds to me like you have the dreaded vib. It is usually drive shaft or half shaft related. To start I would index and rotate the driveshaft 90 degrees.
Sold
2004 Cobra, Whipple ,TH-400
Burning Corn
9.97 - 135.5
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03-17-08, 04:55 PM #8Senior Member
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Does the vibe start at about 70 or so? Or is it always there when driving? If it is constant then I doubt it is the unbalanced drive shaft prob, but if it come around 70-80 then it is more than likely the drive shaft. It is a know problem with these cars.
JoshBlack 04 Cobra
KB 2.2 @ 19#'s, 3.25(15#) upper, 4# lower, CAI, Kooks LT's, Catted H,
SLP LM1 CB, 60# inj, BF idlers, BF TB, Zoom ZVT Stage 3, 26 Spline, MGW,
2400 MAF, Ron Davis Racing HE, SCT tune, AFS 10.5, 315/35/17
Originally Posted by wickedcobra
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03-17-08, 07:13 PM #9Junior Member
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No the noise is constant at any speed above 20mph. Thanks for the advice. I'll keep you posted once I learn more.
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03-17-08, 08:08 PM #10Senior Member
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Are you the original owner of the car?
If not, I'd think it was something like a bad pinion angle. The 'vib' (I think BurnTire meant vibe) was lessened for me, when I swapped out the stock diff bushings for the Maximum Motorsport aluminum diff bushing set. You can dial in the correct/matching angle to the transmission output shaft. Sure, mine only has the vibration at like 90, but I'm rarely running down the highway at a constant 90. Also, if the rear diff was serviced (oil drained and refilled) for any reason, I'd be thinking that the level may not be where it should be (burnt bearings).
Just my two cents.'03 Cobra - Mildly modded. A work in progress.
12.566 @ 110.755, 1.89 60' on street tires
'93 Notch - Looks faster than it is.
'72 F100 4x4 - Dormant, for now.
Race '99 L - 12.40 @ 110
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