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Old 06-21-2014, 10:36 PM
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Shaking around 70 mph

I've never owned a lifted vehicle, but my new (to me) 99 4.0L shakes a bit when I'm going 70 mph or above. Enough that my passenger seat is noticeably shaking pretty hard when I look over. It has a 3.5 inch skyjacker lift on it and 33" tires. It's also a manual, not sure if that makes a difference. This also only sometimes happens. I'll be driving along at 70 for a few minutes and then suddenly it's shaking and then it goes away again. Any advice is appreciated

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Old 06-21-2014, 10:44 PM   #2
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At 70 miles I would like to say that it will the tires.

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Old 06-21-2014, 10:50 PM   #3
Knows a couple things...

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Speed sensitive vibrations are nearly always tire related.
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Old 06-21-2014, 11:52 PM
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I'll check the psi tomorrow and think about getting them realigned if that's not the problem. Thanks!
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Old 06-22-2014, 01:06 AM   #5
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I'll check the psi tomorrow and think about getting them realigned if that's not the problem. Thanks!
FWIW I had a blazer that had a vibration that didn't become noticeable until 65-70+ I kept taking it back to the tire place...had them checked for out-of-round, etc. The tires were fine and the balancing was on. Come to find out, I needed two front wheel bearings. Funny thing was they weren't giving off that howling sound and nothing was noticeable at lower speeds.
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Old 06-22-2014, 03:04 AM   #6
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Quote:
Originally Posted by Jerry Bransford View Post
Speed sensitive vibrations are nearly always tire related.
This ^

If you rotate front to rear (do one side at a time and drive) you can determine which tire/wheel is bad.
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Old 06-22-2014, 09:02 AM   #7
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I had something similar at 60 MPH. I had my tires re-balanced and rotated, and she rides smooth as butter again!

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