SHELBY GT 350 Member
Joined: Sep 2010
Location: see user name
Yeah could be out of balance tire(s), or if the vibration is coming from up front then possibly may need a new hub/bearing assy (about a $60 part and very easy to replace) but really you'll have to go drive it and see. Chances are it isn't any sort of catastrophic problem - it's a used car from a seller you don't know though so ya never know lol, but "chances are" it isn't a big deal or otherwise super expensive fix. If you don't know a whole lot mechanically, it may be in your best interest to pay a shop/mechanic of your choosing to look over the car and give an opinion on it's overall condition (and obviously advise on the vibration issue) prior to you pulling the trigger and purchasing.
Window motor replacement is pretty easy, the part itself is somewhere in the $50 -$75 range depending on where you buy. Now, if the window is stuck in the "down" position then replacement is a bit more difficult (I've had to do it before, it's not fun at all that way). But window "up", super easy.
Other than that it looks like a very nice and basically bone stock Mustang.
2001 GT Convertible
All the usual bolt-on's /200 I6, C4
And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4