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Has anyone noticed their passenger seat shake at 75-80mph? I noticed that at about 80 the seat shakes pretty aggressively when nobody is sitting in it. Passengers tell me they don't feel it, but when they aren't there, it moves. I have taken to the dealership 3 times and it is about to be 4. HELP!!!!
 

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Sounds like a tire is out of balance. Passenger side, most likely.
 

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I wish. That is what they thought and yet I'm still dealing with it.
Something that rotates is vibrating/out of balance.

Engine: No, not RPM dependent, shakes at specific speed.

Transmission: possible, not likely.

Drive shaft (propeller shaft, actually): Check carrier bearings, mating flanges.

Differential: If it is, you'll hear it soon enough.

Axles: Possible CV joint...


It's most likely a bad tire.

Road force balanced?
 

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I had a shake at75-80 mph. It turned out to be the tires. If you have the Goodyear RSA's on there they are crap. I put some Hankook's on and the issue disappeared.
 

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x2 on the road force balance. They will do a static rebalance over and over and it will not fix the problem.
You need to find a shop that has a road force balancer and have them do it. You will be much happier.:beerchug:
 
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