Originally posted by Grandpa X:
The Pre 78 are high pinion too... and are 1/2 inch thick tube all the way out.
bull shit they are.... Pre '78 use standard cut gears. That means they're not high pinion diffs...
The HP diff didn't get used 'til '78 when the Bronco got upsized to a "Full Size" sport-ute based off the full size truck of the day.