"Fox body" =1979-1993 Mustangs.
There exist manual gearboxes for Rangers. Rare but available the first 5 years or so the Rangers were produced. Just like the power steering boxes, they are swappable onto any Ranger up until they changed over to rack and pinion steering in the 90's. Good luck finding one of these boxes, they are only found on the absolute bare bones base model Rangers. They didn't seem to be really popular. You could also use the VERY rare 80-82 F100 optional manual gearbox but you'd have to swap the Pitman arm out for yours.