dumb ***** question.
 

What is the thread size on the shifter for the 2003 Mustang GT??? I have one, but don't have a thread meter... of course I called my dealership which then sounded as dumb as ever as they tried to figure out what I was talking about let alone give me the proper answer. Ford reallly needs to review who they are hiring in their part shops at some of these dealerships...

Well, I'm pretty sure your car came with the Tremec 3650 tranny. So logic would suggest it should match the shifter that comes with the 3650.

Most speed shops can pick the correct thread size by knowing which year\type Mustang you have (Hence knowing which tranny comes stock...) ;)