Is Royal Purple a good transmission fluid choice for my TJ?

You still have it wrong, Redline MT-90 in the tranny and ATF in the gear box, Download the service manual and do some reading. And a word of advise, don't fuck with the TJ Guru;s on this site, it won't take you long to figure out who they are, some are nice about it, some not so much! Welcome and have fun wit you new Jeep!
So what your saying is to not use my-90 in my transfer Case? Can you link what I should use for my transfer case then?
 
So what your saying is to not use my-90 in my transfer Case? Can you link what I should use for my transfer case then?
Are you serious? How many times was I and others here explicit on ATF being the factory recommended lubricant for your transfer case? 5-6 times?

One last time, ATF is what goes in your transfer case.

P.S. I'm starting to wonder if you're really just trolling us.