E-Maxx ball type differential

[captain harlock]

Does any of you know if there is a specific company that makes and sells e-maxx ball type differentials? If not, do you think that it would be something interesting if someone start making such diffs for monster trucks? What are the limitations of such differential if one was made for the e-maxx and why do you think it would be a bad idea? Probably rc-monster.com would like to start this project and I can hook you up with some drawn designs if you want.:)