No way you get a used tranny in a new ford, That dealer is hiding something trying to cut corners. The fender i suspect was tapped before you goy it. They shift real easy. Go around and check the fit of the whole front and more then likley the bumper is out too. But I'm afraid that is a coin flip as once the car goes off the lot who's to say who did it. But no way do you accept anything but a brand new tranny. Contact the ford rep on this site. Shes pretty good at cutting through the BS.
1987 5.0 LX ( sold in 92)
2011 GT/CS Convertible .Electronics package,
Security package,HID headlights,comfort package