Okay i have a 95 ranger 4x4 speed 3.0L and i have a 4.0L out of an explorer i want to put in. i believe it is a direct bolt in. but i wanted to know if i have to change the ECM or not? i know that the ECM for both a 3.0L and 4.0L are in the same location and look the same. but i want to know if i have to get a 4.0 ecm or if i can just use my 3.0 wiring harness and ecm. Help me?