I have a 92 XJ,4.0,5 speed,231 and I want to put an automatic in it.What all is involved.I have a AW 4 and a 242 out of a 1988 XJ and an AW4 out of a '95 XJ,which one would be easier to use?Would the wiring be built into the wiring harness for the auto?I know I would need the trans,ECM,flex plate,torque converter,cross member?,drive shafts?what else?