With Ford's lack of reliability, I wouldn't recommend it, but if you're ok with voiding your factory warranty, then go ahead. As difficult as it is to get mfg.'s to honor drivetrain warranty repairs you'd be giving them an easy reason to deny any work.

If you want to destroy a vehicle that already has earned a reputation for problems, and void any warranties in effect as well, let us know how that works out for you.

I wouldn't push it if you're talking about the bronco made in the United States the best you can get is a twin turbo GDI and that's already bumped up. And if you buy one of those Mexican made ones I'd really be wary about a 4-cylinder one bumped up that high