Sometimes it is valuable to know your factory calibration code. You would need it to buy a tune for a flash tuner like those from SCT. It might also help while junkyard shopping for a replacement processor.
1995~2006 Ranger 104-pin EEC-V (single connector):
Look for the label on the PCM which is located in a slot in the passenger side firewall. The code may also be found on a sticker near the passenger side fender (as shown) or elsewhere depending on the year. The code is 4 characters and varies based on the year, engine, transmission, drive, emissions region, etc. of your truck. In this example the code is GDM2; yours will probably be different:
2007+ 170 pin PowerPC processor (three connectors):
Since the code label is often hidden, it may be necessary to pull the PCM out of its niche in the firewall. In this example, the code is BNM2; yours will probably be different.