-The TJ AX-15 shifter is a bit different (taller) than an MJ/XJ shifter. It can work, or an XJ/MJ version will swap right in
-the YJ/TJ transmissions clock (rotate) the t-case up a bit. some guys have reported needing to take a hammer to the floorboards to make sure the t-case doesn't contact, other have not needed too
-you'll need a pilot bushing for a mid 70s CJ 304
the rubi case should bolt up to any AX-15 (both should be 23 spline) but you'll need to figure out how to do the shifter linkage since the YJ/TJ links are a bit different than the MJ/XJ stuff.
I put a 99 TJ AX-15/231 into my 88 MJ using the CJ bushing, the TJ shifter, no hammering of the floor, a custom crossmember, a mishmash of TJ and MJ linkage pieces, and I adapted the TJ slave line to my stock MJ master line with a $2 compression fitting from the hardware store. Would I do it again? yes. :D
stock T-case in a TJ on top. stock t-case in an MJ on the bottom