MarkW

and they don't find any bent wheels or anything. At about 70 to 75 I start to get a vibration. It doesn't seem to get any worse when I push it past 90, maybe just slightly. If I let off the gas, it seems to get a little better, but it is still there.

I don't feel it through the steering wheel as much as I do through the seats. With the passenger seat empty, I can see the backrest vibrating and the car seat base in the back seat starts to rattle

What other things will start the vibrations? I have heard of the bearing holding the drive shaft, but that seems to be very rare. (The U bearing I think it is called)

Could control arms cause this? I am still on the originals and at my last check up a month ago my indy said they are still tight, he was surprised that they are still good after 110K but didn't want to replace anything that didn't need replacing.

If it were the Tie Rod Assembly I would think I would feel it in the steering rather than the seats.

I have not been able to find anyone close with wheels that will clear the HP2 to swap the tires and see if that corrects it. Anyone in Utah willing to help on that one?

Any and all advice is appreciated.

Murph

If you don't feel it in the wheel it's not front end. Could be 4 wheel alignment?

MarkW

I had the alignment done less than a year ago and not getting any weird wear. Tires only 6 months

TXurS6

Friend of mine in an S4 hit a pothole and bent a couple of wheels. We swapped wheels and tires and a vibration remained at highway speeds. Ultimately it was a bent front axle.

MarkW

No, nothing that I can remember.

LuvnhatemyA6

What where the runouts on the balance report?

Murph

Another idea. Possible belts slipping. Swap fronts to rears and see if vibration follows

audigirl007

do you have stock wheels on? if not, maybe your rim is bent on the inside which would cause more of a soft vibration. my vibration was somewhat violent lol... and i could tell exactly where it was coming from. good luck!

TXurS6

Eliminate each wheel and tire one at a time?