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Old 05-20-2016, 12:50 PM
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Vibrations when slowing down?!?

Hey everyone, so I am planning on buying a Jeep soon and the one that I looked at has a very strange vibration problem. It doesn't seem to happen except when I'm slowing down at a light or stop sign. It only happens when I am going between 10 and 0 miles an hour and slowing down. Also, it becomes more noticeable the slower you get until about 0 mph. It's not too bad but you definitely know it's there. The dealer told me the tires were just out of balance and that they would fix it before I took ownership, but who knows... Does this sound like something that I should be worried about or could it truly just be a balance issue? It doesn't seem to happen when under load and pulling away from a stop.

Also, it's all stock as far as I could tell (No lift, or suspension work done) only 60k miles. BUT it does have some pretty aggressive tread BFG tires and they looked a couple inches over stock size, so I was thinking this could be the issue?

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Old 05-20-2016, 02:17 PM
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Re: Vibrations when slowing down?!?

I wonder if it where unbalanced wheels, if it wouldnīt show up at higher speeds as well, or even more.
Do you feel the vibration when you donīt use the brakes? Could be a warped rotor.
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Old 05-20-2016, 02:23 PM
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Re: Vibrations when slowing down?!?

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Originally Posted by Frango100 View Post
I wonder if it where unbalanced wheels, if it wouldnīt show up at higher speeds as well, or even more.
Do you feel the vibration when you donīt use the brakes? Could be a warped rotor.
Doesn't show up at higher speeds, just that approx speed range. There is some tire noise and a fast "woowoowoowoowoo" noise as the wheels are going, but I assume that's normal for m/t tires. If I recall right it happened even when downshifting and coasting, without using brakes.
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Old 05-20-2016, 11:17 PM
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Re: Vibrations when slowing down?!?

I had a similar problem, rotated wheels, rear passengers to front drivers, front drivers to rear passengers, rear drives to font passengers, front passengers to rear drivers, I am sure it was the fronts that were wearing funny, anyway it fixed the problem.
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Old 05-21-2016, 02:27 AM
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Re: Vibrations when slowing down?!?

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Originally Posted by daultonhubbs View Post
The dealer told me the tires were just out of balance and that they would fix it before I took ownership
Tell the dealer to fix the problem before you will consider taking ownership. Don't wait until it's your problem. Make him fix it while it's his problem. When he says it's fixed, test drive to verify.

Depending on how rough the previous owner was, the tires could be flat spotted from sliding the tires by heavy braking, or if it spent the winter in the garage the tires could be flat spotted from sitting in one place too long.

It could be a warped wheel that no amount of balancing can fix. They could just need rotating. Rotate the left sides front to rear and right sides front to rear. Every tire man I ever talked to told me that cross rotation from one side to other could break the belts inside the tire as they acquired a 'set' from running in the same direction all the time. If you rotate sides, the tires will be running backwards from what they had been running. Cross rotation was pretty common on bias ply tires but a no-no on radials.
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Old 05-21-2016, 08:56 AM
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Re: Vibrations when slowing down?!?

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Originally Posted by Governor View Post
Every tire man I ever talked to told me that cross rotation from one side to other could break the belts inside the tire as they acquired a 'set' from running in the same direction all the time. If you rotate sides, the tires will be running backwards from what they had been running. Cross rotation was pretty common on bias ply tires but a no-no on radials.
That may have been true on early radials and it's definitely not something you want to do with any directional tread tire.

Rearward cross rotation is the recommended method stated in my owners manual and what my dealer uses. They've been doing it on my last two GC's and I've never experienced any problems due to it.
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Old 05-21-2016, 09:09 AM
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Re: Vibrations when slowing down?!?

Quote:
Originally Posted by daultonhubbs View Post
Hey everyone, so I am planning on buying a Jeep soon and the one that I looked at has a very strange vibration problem. It doesn't seem to happen except when I'm slowing down at a light or stop sign. It only happens when I am going between 10 and 0 miles an hour and slowing down. Also, it becomes more noticeable the slower you get until about 0 mph. It's not too bad but you definitely know it's there. The dealer told me the tires were just out of balance and that they would fix it before I took ownership, but who knows... Does this sound like something that I should be worried about or could it truly just be a balance issue? It doesn't seem to happen when under load and pulling away from a stop.

Also, it's all stock as far as I could tell (No lift, or suspension work done) only 60k miles. BUT it does have some pretty aggressive tread BFG tires and they looked a couple inches over stock size, so I was thinking this could be the issue?
One look at that tire tread explains your concerns... that's a pretty aggressive tread and you're going to feel and hear that when slowing down to a stop.

That "woowoowoo" sound when driving is also not uncommon for a tire like that. It's more likely caused by an out of round tire or one that hasn't been wearing evenly more than simply a balance issue. A balance issue wouldn't be noticed from 10-0 mph. If by some strange chance it was then can you imagine what that vibration would feel like at highway speed? If you notice any cupping of the tread that would indicate bad shocks and/or an alignment issue. That would only enhance that sound if it's been driven like that for a time.
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Old 05-21-2016, 09:36 AM
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Re: Vibrations when slowing down?!?

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Originally Posted by MDBones View Post
That may have been true on early radials and it's definitely not something you want to do with any directional tread tire.

Rearward cross rotation is the recommended method stated in my owners manual and what my dealer uses. They've been doing it on my last two GC's and I've never experienced any problems due to it.
Yep, you were absolutely right. I need to get out of the stone wheel age. lol. Here's Tire Racks rotation recommendations including cross rotation. Good catch: Tire Tech Information - Tire Rotation Instructions

Lesson to self: Google first, post last.
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Old 05-21-2016, 09:44 AM
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Re: Vibrations when slowing down?!?

Quote:
Originally Posted by Governor View Post
Yep, you were absolutely right. I need to get out of the stone wheel age. lol. Here's Tire Racks rotation recommendations including cross rotation. Good catch: Tire Tech Information - Tire Rotation Instructions

Lesson to self: Google first, post last.

Not a problem, Gov.

We all get set in our ways and thinking... I'm as guilty of that as anyone else is. If it's any consolation, I had a tough time buying into the cross rotation method back when my dealer told me that's how they do it now.
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Old 05-21-2016, 05:59 PM
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Re: Vibrations when slowing down?!?

I had the same problem with my 2005 TJ RM Ed. I had 33" Nitto Mud Grapplers on it at the time. Turned out the the treads were unevenly worn (saw toothed) due, I was told, to a failure to rotate them. An easy way to determine if you're having the same issue is to drive from a wet area onto a (flat) dry area. It will be clear if there is uneven wear as the track pattern left on the dry area will be irregular.
You can actually feel it too, if you hold your hand flat and move it across the tread.
Good luck!
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