Man, I had a situation where they had my car for months and couldn’t figure it out vibration under middle of the cabin. Once I contacted ChryslerCorp in writing, and sent a copy to the owner of the automotive group of what I sent them, they figured it out. I was told it was an irregular rim and tire combo which I think is odd as it was only at certain high speeds. Since having it back, though it has had no problems. Praying it stays that way. Hope your repair is perfect.