Super bumpy on the highway????

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treagan82

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So I thought it might be time to replace my air suspension recently, but to my surprise it's already been done. Still probably needs replacing, but not sure. Basically when I get up to highway speeds (55-75) my vehicle has a small bounce to it. It's very fast, almost like I have a tire out of balance, but I had them all checked and they all came back great. Where should I start?
 

JasonH

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Check struts and tire pressure. If you're getting inadequate damping over bumps, the struts are worn. Cheaper tires may have a lot of flex at high speeds. My Hankooks were like this. Made the vehicle feel unstable over 75 mph.
 

Tuck

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See if they road force balanced your tires when they checked them. If not, and it's your tires, the road force balance may get rid of the shake.
 
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