You mentioned GA 400 - I would be curious as to which dealers you have tried. So far I have good luck with the GMC dealer in Buford.
So far so good on the repairs they did on mine - they had to replace the steering box as TSD C did not work.
I will admit - I am not a ford person at all but I have been looking at them as a replacement if it fails again... I have had Rams before - they have their own problems.