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Old 01-27-2014, 11:47 AM
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Vibration at 50 to 60 mph

What I have - 2009 Unlimited
stock wheels and tires
3" budget boost lift (spacers)
Sky Jacker shocks
1.5" wheel spacers.

The Issue - over the last few months the Jeep will shake when I hit the brakes between 50 to 60. There is also a vibration at the same speed when speeding up. I had noticed a slight difference after the lift but it has been getting worse.

What I have done - Had wheels balanced and rotated - some improvement
Removed wheel spacers - made it worse
Watch the video on the death wobble and completed inspection - no issues noted
Changed the 14mm bolts to 9/16" and have torqued them to spec.

Is this the death wobble or could it be the tires.

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Old 01-27-2014, 11:52 AM   #2
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It could still be the tires. How worn are they? Were you planning in replacing them? If not, why the lift?

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Old 01-27-2014, 11:52 AM   #3
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Sounds like a drive line vibe to me. Where do you "feel" it at? Steering wheel, floorboard, or in the peddles?

Or do you mean the whole jeep actually shakes back and forth? If that's the case could be a warped rotor.
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Old 01-27-2014, 11:52 AM   #4
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Check your ball joints as well.
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Old 01-27-2014, 12:01 PM
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Tire are in good shape. The lift was for looks only.
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Old 01-27-2014, 12:07 PM
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If it were the drive train why would I only feel it at certain times. The Jeep is a daily driver and not a mud toy.
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Old 01-27-2014, 12:11 PM   #7
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Possible hub bearing since its at speed and braking. Ball joints? Where do u feel vibration at? Steering wheel? Floor? Seat?
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Old 01-27-2014, 12:12 PM   #8
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If it were the drive train why would I only feel it at certain times. The Jeep is a daily driver and not a mud toy.
Parts fail no mater what the jeep is used for. Harmonics come into play with drive line issues.
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Old 01-27-2014, 12:15 PM
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Yes, Yes and Yes. the steering wheel moves from side to side. I it feels like the entire Jeep is moving from side to side.
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Old 01-27-2014, 12:16 PM
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I have checked the front end as per the video posted on the forum concerning checking for death wobble. Nothing seemed out of wack.
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Old 01-27-2014, 12:18 PM   #11
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Warped rotors or bad hub bearing.
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Old 01-27-2014, 12:19 PM   #12
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Im placing my money on a warped rotor if nothing is lose on the front end.
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Old 01-27-2014, 12:21 PM   #13
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Is there a growling sound as u go down the road coming from the front area.
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Old 01-27-2014, 12:25 PM
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I will have them check the rotors when I get the tires changed. Hub bearing maybe but I am leaning more towards the tires or rotors.
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Old 01-27-2014, 12:27 PM
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When I do not have Sirius Octane blaring I do not hear any noise coming from the Jeep.
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Old 01-27-2014, 01:58 PM   #16
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Tire are in good shape. The lift was for looks only.
I would have them road forc balanced by a qualified shop. You can't see a bad belt. How many miles are on the tires? Vibrau at 50-60 mph usually points to improper balancing. Another thing that points to the tires is the fact that it was worse when the spacers were off. They may have provided some counter balance.
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Old 01-27-2014, 02:18 PM   #17
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Quote:
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I would have them road forc balanced by a qualified shop. You can't see a bad belt. How many miles are on the tires? Vibrau at 50-60 mph usually points to improper balancing. Another thing that points to the tires is the fact that it was worse when the spacers were off. They may have provided some counter balance.
X2 speed sensitive wobbles are almost always the tires.

Make it a habit to peak underneath at the CV joints.
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Old 01-27-2014, 04:00 PM   #18
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If you hold the steering wheel just with your fingers and the wheel is twisting left and right, then it's a front end issue. A rear end issue will wobble the car but the steering wheel generally stays straight. OK so it's the front end. Now swap you wheels front to back. Still the front end? If the wheel is still wobbling you've eliminated the tyres and it's the rotors. If the wobble no longer on the steering but now the car, then it's a tyre (or wheel) that's now on the back.
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Old 01-27-2014, 07:09 PM   #19
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Quote:
Originally Posted by vstartoups View Post
What I have - 2009 Unlimited
stock wheels and tires
3" budget boost lift (spacers)
Sky Jacker shocks
1.5" wheel spacers.

The Issue - over the last few months the Jeep will shake when I hit the brakes between 50 to 60. There is also a vibration at the same speed when speeding up. I had noticed a slight difference after the lift but it has been getting worse.



.
You have a warped brake rotor, that is causing the shaking at 50 to 60, when you apply the brakes!

Quote:
Originally Posted by vstartoups View Post
Yes, Yes and Yes. the steering wheel moves from side to side. I it feels like the entire Jeep is moving from side to side.
This is a bad tire, or a wheel/tire that is way out of balance!
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Old 01-27-2014, 07:13 PM
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Two bad front tires.... crap. I sized up to 33'' Cooper AT3.
NO MORE VIBRATIONS
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Old 01-27-2014, 07:27 PM   #21
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^^^That's great news, enjoy your Wrangler......

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