Just my curiousity running wild here does the fact that the ford is reverse rotation mean that the gm or chevy one will not work???,or our the ring and pinion the same also when I replaced my 3.55 gears in my dana 44 F150 front end had to purchase a new case for the thicker ring gear.
The Early bronco is standard rotation, low pinion Dana 44. The high pinion Dana44(found after 77) is reverse rotation, and has to have the revrse cut gears. The cut off on carrier size is 3.91's and up need 4 series carrier, so if you're changing from 3.50's you need to drop 50 more bucks and get a different carrier, you can use the same spider gears.