I have a 2002 ford.Ranger 4.0 4x4. I bought a 2004 same specs. When I look online for an a used engine and transmission for the 2002, it says the 2004 does not have the same engine or transmission. . What if the difference between the two? I know it's two separate questions but Why can I not install the 2004 into the 2002? Any help appreciated?

 

That's kind of what I was worried about.I wouldn't be surprised if mechanically they're the same.But there is some kind of problem with wiring or software the computer