I guess I assumed wrong about what compurter is in my truck. I owuld like to know what type I have in a 98 4.0 and also where to get the code reader.

I forget if its an eec-iv or eec-v but it definately uses an OBDII code reader. You might want to read this thread, since it's the same thing (http://www.rangerforum.net/forum/showthread.php?s=&threadid=15387)

Where did you get your code reaer ghstwolf? Thanks