Originally Posted by
mcdonaldm
actually all rearends from 57 - 72 in the F100's were the same width and perch location, so you are not limited to just 57 - 60. the early rear ends (57 - 60) are considered the weakest rear ends due to the 3rd member being a weak casting and the tubes are just butt welded to the center section. the later rearends (proably 67 to 72) had the stronger axle tubes splice welded to the center section and the stronger 3rd memeber casting.
Also if you look for a camper special F100 from 71 or 72 with a 390 (maybe even 68 - 70, but i know 71 and 72 for sure) good chance it has 31 spline axles in it.
Camper Special, Contractors Special, Farm and Ranch Special:
19
68/72 F100: Ford offered a H/D 9" that has a
9 3/8" ring gear,
31 spline axleshafts and Traction-Lok.
Only 5 parts are the same as a 9 inch: One pinion bearing, one pinion bearing race, pilot bearing retainer, housing gasket and pinion seal.
EVERYTHING else is different!
1957/67 F100 use the same R/L axle shafts. 1968/72 F100 9" use different 28 & 31 spline axle shafts, as the rear brakes are larger (11" x 2 1/4").