Your biggest problem if I understand this correctly is that on our jeeps the starter is on the passenger side. They didn't make a 47rh with the correct side starter, let alone the right bolt pattern. Now what you can do I believe is remove your 46rh and rebuild it with 47/48 parts (planetery gear sets, wider bands, drums to accommodate more clutches). I know that you can also use thinner steels and "thinner" clutches to stuff more clutch counts into the transmission. What I don't know is if using your 46rh valve body in its stock form would be up to the challenge. But I also don't know if it would be best to install a reprogramming kit for a 46rh, or for a 47/48rh. I believe that the valve bodies are pretty identical as far as layout (the separator plates are probably different, but the basic stuff is the same I believe.) Someone with some more knowledge might be able to answer these questions. I've been toying around with the same idea that you have, although I do know that it gets relatively expensive to start putting in new planetary sets (around 200ish a pop, and there are three separate sets). And for the power that we are putting out on a stock 5.2l it would be overkill. But it would just be cool if it were feasible. Someone with more experience speak up on this!! Correct me if I am wrong!