Well the comment about early bronco front axles have low pinion, not high pinion. The 78 and 79 bronco's had HP 44. You would be better off looking for a 76 or 77 HP dana 44 from a f150 because they have the welded on radius arm mounts or a extended cab front axle because they have leaf springs up front and a dana 44. The half ton units would be alot better in the long run because parts are more redily available. If I remember correctly they run 65-66" WMS-WMS. The early bronco's run about 58-59" WMS-WMS. You might consider getting a matching ford 9" too because they can be made pretty damn durable and you keep a easy to find axle shaft and save some weight too.