Body Vibration at 75 MPH and up

[daveeeooo]

hey gusy new here. Wanted to see if maybe someone could help me out. My car vibrates at 75 mph and up, it seems like its coming from the rear wheels but I cant be sure. Ive driven it up to 114 and it doesnt go away with higher speeds. I just got new tires and had the wheels balanced and the alignment done. It did not help. Any thoughts on where I should ask my mechanic to check? and/or trouble shooting

[Bill_SoCal]

:welcome:

I would take your vehicle back and have the wheel balancing checked again...I've had to do this many times due to high speed vibrations after new tires. My '03 has 153K on the speedo and I've never had an alignment. Any problem has always been correlated to balancing.

All the best,

Bill :beer:

[986fan]

Take your wheels to a shop that has a Hunter 9700 RFV (Road Force

Variation) sensing balancer and somebody that knows how to use it.

[kbrandsma]

In the three years I have owned my Boxster I have experienced this twice. The first was an alignment and tire problem and the second was my undercarriage plastic panel that lost a couple of screws and at higher speeds vibrated the entire car.

[daveeeooo]

thanks for the info guys, ill bring it back to the guy who did my balancing and tell him to run it again