car shakes

[eclipsemustang]

Ok so i stored my car for the winter about 3 weeks ago, and last weekend my dad asked if he could drive it for a while because we were down one winter car, and i have winter tires plus i have fwd and he has rwd. so he takes off my 18's and puts on my winter tires which have been sitting in the garage for about a year, and he starts to drive my car home from the storage garage, which is a 25 min highway drive, and he notices the car is "shaky" but he keeps driving because he was in a hurry. he later finds out he didnt put the tires on very tightly, and they may not have been snug. so he tightened everything down and it still feels shaky. so i take off the tires and put them back on nice and snug and i drive it past my dad going about 5 mph and he says tires look to be on right, but the car feels like it moves back and forth real oddly and you can see how it moving back and forth when you watch it drive past. any clue what the problem is?

 

[Boostjunki84]

The wheels may need to be rebalanced.

 

[eclipsemustang]

that was my guess since the tires have been sitting for a while and i had no problems before the switch, i just want to make sure that it isnt from driving it with the tires not fully on

 

[Boostjunki84]

It's always a possibility that it may need an alignment, but I would get the tires balanced first and see if that fixes it.