Vibration at 70+ mph

Tire out of balance.

first guess would be wheel/tire balance. does it feel like it is a wheel spinning? I had a 95 park avenue that started about 80mph with a bad vibration then got to the point where 70 mph would cause it. it felt like the tires were leaving the road.

wheel weights can fall off from time to time. if you have purchased tires for your car in the past and paid for lifetime balance/rotate then i would start with that. another thing would be to jack up the car safely using jack stands, and shaking each tire for play in the wheel hubs.

also it might help with some specifics of which car you own. year, model, trim/motor.

2014 new body Ltz v6


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12 lt said:

Tire out of balance.

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I also have this issue on mine, on my oem 19" and aftermarket 22" wheels. Its not so bad on oem set, but still slightly noticeable. My aftermarket wheels on the other hand is a bit strange. They vibrate between 65-75 mph, but oddly enough it goes away at around 80+ mph speeds. Both sets have been re-balanced multiple times. So maybe this info could possibly rule out balance.

The tires road force balance could be out of spec. I believe the spec is under 15 lbs of road force per wheel/tire. Of course the smaller the number the better.

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if you have idiot kids balancing your stuff, then you should have the manager watch when you get balanced. i know they dont take the time to clean off the rim and the weights fly off. sadly i'm forced to buy the unlimited balance/repair package for 100 bucks but as much as i need balancing, its worth it. also when the manager watched him balance the wheels, i had no issues after that thankfully.

Tire(s) improperly inflated (over or under, an easy check definitely I would take care of this).
Tire(s) unevenly worn (this could be due to suspension issues which if you notice this ...)
Tire(s) out of balance (this usually results in vibration around the 50-60mph range and then goes away as you drive faster so a 70mph vibe from balance is somewhat unlikely).
Worn wheel bearing(s) (these are usually accompanied by some sort of noise or even a singing or whistling sound).
Missing lug nut(s) / bolt(s) (another easy check).
Brake Rotor(s) out of round (this is definitely among causes for high speed vibration).

Those are among the most likely culprits...

I had all four out of balance!! Stupid winter weather!!! Fixed all good now!!

Thanks guys


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Glad to hear you resolved your issue.