Yes they did, and before they put in the turbos they had to upgrade both transmissions. Roadkill and HRG purposely tear **** up for the ratings, a normal person would not spend all that time and money just to beat on it and destroy all their hard work. Sometimes they have a good idea, like the twinpala project, but they end up cutting corners just so they can go out and eff it up.
If you took that idea and tried it on a 5th gen explorer and took your time and did it right, you could have an awd 550+hp explorer. And if you started with a 2.3L 4 banger model, you could probably save the second row seats as that package is small enough. Also, if your working with a sport model, you can end up with 730 hp stock and somewhere around 850-900 modified. Imagine the surprised look on a grand cherokee trackhawk owner's face when you outrun rim trying to get to the next stoplight