What do you guys think 3.58 posi

Only way it's worth that much is if everything is new and upgraded. Like Moser axles, new Richmond gears with all new Timken bearings. Billet yoke. New upgraded brakes. Etc....

BTW: Way back in the early 60's they did offer a 3:58 gear ratio. That was in one of the old cases which I don't remember the # on. Make sure it's a 489 or 742 case.