are you asking if you can put your rear axle in the front? 'cause the short answer is no.
front axles for MJs/XJs is the Dana 30.
the computers don't control any aspect of the 4wd system. it's all old-school lever action :D
t-case shifter linkages RARELY comes with the t-case. the key part you need is the bracketry for the linkage, half of which bolts to the transmission (and is transmission-specific meaning that an AW4 or AX-15 bracket won't bolt to an AX-5) and the other half bolts to the underside of the cab.
Buy a whole 2.5L/5speed XJ and make life easy on yourself. :thumbsup: