Is the 2001 ford f150 4x4 rf-f7ap-7006 aa trans. Compatible with a 2004 ford f150 4x4 rf-3l3p-7006 aa transmission?

 

Yes and no. It will bolt up as long as both trucks are V8. However, they changed the output shaft ring gear in 2004. Look at post #4 in this thread:

https://www.f150online.com/forums/tr...ml#post5235925

You will need a programmer and a custom tune to make it electrically compatible.