Rather than just guessing, why don't you get the service manual for your year. Download it here in forum.
You know, if you don't know what it is, don't touch it.
With that you could look at the RPO codes and actually know what your truck is equipped with.
You know, if you don't know what it is, don't touch it.
With that you could look at the RPO codes and actually know what your truck is equipped with.