It's been about 10 years since I pulled the interlock pill out of my Model 18 T/C and now I have to do it on a replacement T/C I'm putting in. I searched and didn't find anything detailed enough. What do I have to do to get that little suppository out of there?

You have to tear the tcase down pretty much completely. It's in the front shift housing forward of the shift forks. You should find everything you need to know here: http://ajax.extremejeep.com/mike/tcase/