Any problems replacing a 1991 Ranger 2.3 with a Mustang 1991 2.3L
i believe the mechanics of the engine are pretty much the same, or from the research i have done they appear to be. but if your truck is a 4x4 you might run into a problem with the oil pan. but if it was me i would grab everything related to the wiring and computer if he will part with it.
LR