hi guys is been a while since i have posted but i still peek through here once in a while. I have a 2010 kia forte with bout 40k milage i know i drive a shit load but a couple days ago i noticed that the car became very shaky from the back of the car it vibrates a lot so bad it makes the steering wheel shake as well, feels similar to a flat but it does not have one also i changed the tires back to stock and it does the same thing could it be that it needs an alignment or something idk i am a novice at this any help would be highly appreciated
Since you're covered by warranty there's no need to worry. If I had to guess, based on your description, I'd say your rear bearings might be shot. Let us know what your dealer finds...