I thought I would share a PDF copy of a service bulletin (look at PDF link above the images below) that was performed on my 2005 GT Convertible at 12K miles, just before the warranty expired.
I experienced this "vibration" just about time the automatic transmission would shift and did not then know what it was. At the time, my concerns were SHOULD it be an internal problem developing, that I would at least have an "Incident Report".
The local dealership called me up after leaving the car and said "It is FIXED" and they explained about this Service Bulletin. Once I raised the car after getting home, I see they did NOT CHOOSE to cut across the mount but instead just ripped the mount off with crow bars and the likes. I was quite upset at the time because they did not take care or call to explain what was to be done. I understand that in order for the technician to get paid, this was what needed to be done.
I wished afterwards, they had not done this so yesterday, I bought the "UNDO" button, a replacement crossmember WITH the mounts intact! Maybe I'll install it, maybe not but what I find MOST INTERESTING about this whole ordeal is THIS replacement crossmember, though removed from an EARLIER-Built 2005 GT convertible, looks to be dated mid-year 2007. Perhaps a Service Replacement installed BEFORE the TSB came out? (perhaps).
Engineering number 8R33-6068-BA (per white ink dot) indicates a 2008 model-year part if I am correct. This would also seem to say that the "whole part" is a later production or a Service Part IMHO. It was purchased intentionally to put out the "fire" in me over how the Ford dealeship "Ripped off" parts of my "Preservation Piece" showcar. I am still at odds I guess