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Old 07-08-2014, 02:14 AM   #1
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Mystery slow speed BRRRR noise solved

I've been chasing the noise caused by cupped MTRs on my 06 Rubicon. It was a very metallic sound and only happened at slow speeds (1-5mph) and was independent of braking. I searched the forums and others have had this noise and new tires or rotating has "cured" it for them. I knew the cupping of my tires was causing it but wanted to know what the noise was. I drove down the road and hung out the door with my phone shooting video and what I found kind of surprised me. The rattling metallic sound is my front springs oscillating on their lower perch. I have the video but couldn't upload it here. You can see the spring start to vibrate and then as I get to about 2mph, the speed of the vibration in the spring speeds up and the noise becomes apparent. Here's my theory...under heavy braking it doesn't occur because the springs are being weighted very heavily. But, with a light slowing action, possibly one spring has more weight than the other maybe due to road camber and the oscillation is strong enough to let it shake the base of the spring against the axle perch. Wish I could upload the video because it's really obvious, but, I will "cure" the noise tomorrow with a rotation now that I found it. And before somebody says it, everything on the front end is tight and good. I hope this helps anyone else going through this because it was driving me insane! Happy wheeling!!!

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Old 07-08-2014, 09:50 AM   #2
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Was this sound kind of like a metallic rattle? I'm chasing one myself that sounds very similar. Just intermittent at very low speed. A little more noticeable under a little acceleration, but often when I'm pulling in to the driveway almost to a stop also. It almost has a sound like something rattling against the exhaust system, but that isn't the case.

Does this sound the same as yours?

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Old 07-08-2014, 11:09 AM   #3
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Sounds like it could be the same noise. If you want the video, shoot me a PM and I can send it to you. It's the only way to tell if it's the same noise. It's a very distinctive sound for sure.
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Old 07-08-2014, 11:35 AM   #4
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trim 649AC258 B1BE 4315 80EB 510256365749 - YouTube

I was able to upload the short video to youtube. Here it is in all of it's annoying glory. Watch the spring. The quality of the video dropped off a lot when I uploaded it but you can still see the spring move.
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Old 07-08-2014, 11:40 AM   #5
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I've got what sounds like a similar noise, agree it's more noticeable as the tires get worn right before I decide to rotate them, but mine is more noticeable when I'm slowing down (under 5mph). I assumed mine is the heat shield vibrating but I've never really looked into it because it never got worse and nothing's fallen off yet. Just really annoying.
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Old 07-08-2014, 11:43 AM   #6
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That is amazing. Congrats on troubleshooting that one! Good job.
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Old 07-08-2014, 01:12 PM   #7
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Quote:
Originally Posted by 310driver View Post
trim 649AC258 B1BE 4315 80EB 510256365749 - YouTube

I was able to upload the short video to youtube. Here it is in all of it's annoying glory. Watch the spring. The quality of the video dropped off a lot when I uploaded it but you can still see the spring move.
Yep, that's the sound...thanks for posting this.... I'll have to play with mine tomorrow as well.
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Old 07-09-2014, 12:50 PM   #8
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I'm glad it helped someone else. It was maddening finding every bolt and nut tight and still having that vibration.
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Old 07-09-2014, 02:33 PM   #9
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I'm glad it helped someone else. It was maddening finding every bolt and nut tight and still having that vibration.
Haven't got a chance to look at mine yet. Did you have any success getting it solved?
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Old 07-09-2014, 06:27 PM   #10
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Yeah. Rotated them and no noise. But I could feel the thumping now that they were on the back...so I really solved it and bought 5 new Duratracs

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