My '84 has cruise control also, and if it didn't, I would have retrofitted it in a long time ago.
I should have clarified; my apologies...I meant '86 and older trucks that weren't equipped with cruise control, which was a factory option. I don't think I've seen an XLT or Lariat truck that didn't have cruise, but I've seen plenty of XL and base model trucks that weren't equipped with it...that's what I was referring to when I mentioned IDI trucks that were 100% computer-free (although you could even argue that point depending on what radio's in the truck)