Hello i notice i always have my steering shaking going 80-85 maybe a little more but once i i pass that my car's steering wheel stops shaking.I also had a full alignemnt down with printout.i had new tires put on in last november and balance.there conential dws because with the the weather we get up here can be bad and its moslty 30 degress out tops at heart of the winter.Dont forget summer tires actually arent made for 30 degrees and such probably harden up pretty fast to .

 

...what? Maybe your driveshaft needs to be balanced.

 

thats something,i know on a nascar cars they have rpms where it vibrates and i thought maybe that was the reason on these cars but then again