what is it when you go over 45 miles and the car starts shaking from the tires

check the alignment. sounds like one of your wheels is out of whack.

tires are going bald

One of the weights on the rim may have come off or one of the ball joints for the wheel has started to go out.

Either way take it to a shop for an estimate and they will tell you what is wrong with it for free.

Have tires balanced. Or have you tie rods looked at. Or there is a loose nut behind the steering wheel.

could be alot of things alinment to tie rods to a bad tire ot even a bad rim.

Tires need to be balanced. If that does not help, it could be the wheel bearings.

Could be the tires are not properly balanced, a bad shock or strut, alignment problem, improper inflation, or uneven wear.

If you feel it in your seat, its in the rear, if you feel it in the wheel its up front, feel it in both and your tires are out of balance.

you need a front end alignment

It sounds like ur problem my be only ur tires or wheel mounts. After a routine check of the tires, having them rotated & balanced, they may need to be aligned.

Hopefully those should solve ur problem. If not, u may have a more serious problem. From what u have described, it could be that the CV joints r starting to fail. If this is the case, u will need to replace both axle shafts.

You may want to do some more research on the site below before u seek out a qualified mechanic.

PROBABLY THE BALANCE