No they won't. I had an 07 transit with a 70 restriction on it from the factory. I took it to my local dealer who put it on the diagnostic, and he said it's not even listed on the screen.
Of course it's there for a reason, but people don't half fook about at 70 mph. As soon as you pull into lane 3 to pass the middle lane hoggers who do 65 mph, they usually put their foot down and leave you stranded. I left the company soon after.