and idea waht could cause this?

 

check out if your wheels are well bolted.

 

Have you had your tires balanced?

 

 

yes and it still does it, except mine is at 64-68mph.... i know it will stop when i get new rubber. damn -camber

 

does it only do it under acceleration/braking? or all the time?

 

all tha time

 

I have that same problem. Except I haven't bled the brakes yet. Try that.

 

Everybody has pretty much covered the 1st thing to check, wheel balance. It is also possible you have a bent rim, a broken belt in a tire or a tie rod end going bad. Haven't had my 1st cup of coffee yet so I'll stop there. Better get it checked out soon. That broken belt or bad tie rod end could cause you to lose control if they get worse.

 

Rotate the tires and see if it changes. If it does, its one of the rear tires or wheels. If it doesn't, it could be an axle, bearing or even transmission. Good luck.