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Unread 2012-08-18, 12:32 PM   #1
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Default Please Help: Loud vibration/noise coming from drive train, 03 Cobra

I don't know how long this is been doing this. I just bought this car and have put less than 500 miles on it.

It has a little under 24k on it and the list of mods are under my signature.

The cobra is making an audible vibration whine noise coming from (it feels like) under the shifter or farther back. It is consistent in that it always happens in the same spot and is easily replicable.

When approaching and then arriving at 1500rpms under throttle (15% or more) in any gear an noise/vibration/whine/hum starts emitting from below. It's noticeable in all gears but REALLY loud in 4th gear. It dies out at 1700rpms.

Couple of things, it only does it while in gear, if you lightly push on the clutch while it's making the noise it disappears. It does not ever make the noise while it's in neutral and the motor runs fine.

Couple of things done before I got the car. IRS Drag pack bushing kit, McLoed RXT twin disc clutch, 26 spline input shaft. The rest of the mods are below.

Sorry the video is shaky and really doesn't pick up how loud the noise really is.

Something went wrong. Please make sure you added the video correctly.

Video URL: http://www.youtube.com/watch?v=um8_uSQ9dHI
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Unread 2012-08-28, 09:36 PM   #2
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It's hard to hear it in the vid like you said, but I'm wondering about those motor mounts. Is the vibration louder when the car is cold? Does it get quieter (but still there!) after a while, like 20 mins or so...? Failing motor mounts can be predicable and really easy to recreate the noise.

I'm unsure of the type of mounts that you have, some are fluid filled, others are solid rubber and some have air gaps, but visually inspect them for any tears, leaking, or it's even possible that one might have shaken out of its "seat". You can also, after the engine is warm, put on some gloves and shake the whole motor by hand. You shouldn't have any movement. But sorry to say, what you are describing is classic motor mount issues.
The whole idea about modding cars is to express your personality in however manner you see fit.
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Unread 2012-09-06, 10:11 AM   #3
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I don't know what the IRS drag pack bushing set is, but if it changes the pinion angle of the rear end, that could be the culprit.
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