The way I remember it, Ford was going to just build a few truck parts here in Ohio, and I think that was Kasich’s doing. However, there was never anything in the news about Ford abandoning their idea of building a plant in Mexico. I’ll see if I can dig up the old article.
Here is an article from August of this year, reporting that the first vehicles (not parts) were rolling off of the production line in Ohio:
http://money.cnn.com/2015/08/13/news/companies/ford-truck-mexico-ohio/index.html
If the line was already up and running in August, then there is no way that Trump’s rhetoric had anything to do with the move.