So its funny you bring this up cause in my tear down I have noticed that I do not have any vacuum solenoids on my TC, which I'm assuming is because its an '81, not sure how the 4WD system changed over the years.
Also seems as if we had a very similar day today as i pulled my TC off! And I'd like to compare crust cause there was A LOT! Going to write that update right now.
Right. Your truck doesn't have a vac system. I'm wrestling with keeping mine or swapping over.