I’ve seen one truck in town that has it. it is a 81 (I think) high Sierra 1500 or whatever. I noticed it was also on limited edition trucks like a 84 Sno Chaser which I guess also happened to be a Scottsdale.
So I’m working on a ‘84 and I want to put in a posi lock in the rear differential in the near future. It’s a 12 bolt main with 3.73 gears from a ‘76 high Sierra. Is a posi lock install just a simple swap or does it require additional items to be bought and installed too?