Good evening I have a question, what transmission do I need to make 4wd my jeep comanche 87 2.5L ... I have an engine, transmission, 4wd, front differential, ecu of a mj 4.0 but I do not have the 4.0 harness ... or is it easier to put one 4wd transmission special for the 2.5 with the front differential of 4.0 what do I do?