If you do it yourself, a TwEECer is about your only hope. Go in and set the trans type to "0".
But you will have much bigger issues with the other stuff. You can usually turn off the rear O2's. that way you only need 2 instead of 4 oxygen sensors. Then depending on the year of the Explorer, you may have a variable voltage drive to run the variable speed impeler style fuel pump on a non-return fuel system
Then there is all the fuel tank stuff. Canister purge, pressure sensors, fuel tank level, fuel temp. IF the computer sees the fuel gauge not hooked up, the check engine light will come on. So to make it work right you need 2 sending units in the gas tank. One for your gauge, another to satisfy the computer. Some years even pull 14 or 17" of vacuum on the entire fuel system. Then don't forget that the computer pulls vehicle speed out of the data bus system, where it is generated by the ABS system. Forget to swap in the ABS, no VSS and check engine light on. You can stick a VSS in your transfer case but you still have no place to plugh it in the computer.
Like mentioned before, the easiest way to get it running without issues is a mustang computer and wiring.
If you want to run the wonderful 4R70W without the engine computer, then use a Baumantor.