05-06 4WD Recall
First off, never posted here before, so sorry if my formatting or etiquette is off.
I know a guy who was a certified Ford mechanic at a dealership, and I was asking him about my 4LO not engaging. He told me that for my truck (2006 5.4 V8) that there was a recall for a vacuum line that engaged 4WD.
I don't understand how 4HI can engage but 4LO won't. Also, I did some research and the only vacuum line related recall I could find was this:
Does anyone know anything that could help? Thanks.