Diff / axle dimensions

[Jayro]

Hey all, my 73 was originally a 6 cyl but now running a 351. I’ve upgraded the front brakes to discs. Now want to install a 9”

What measurements am I needing to check to confirm for example if this Australian ford falcon one will fit?

 

[c9zx]

Housing bearing flange to flange distance (my reference shows 61.25 inches). Spring perch location and angle will matter as well. Chuck

 

[basstrix]

Housing bearing flange to flange distance (my reference shows 61.25 inches). Spring perch location and angle will matter as well. Chuck

My reference shows the same value except its drive-axle to drive axle flange (the surface the drums will contact) and subtract 5" for housing flange to flange.

My own 72 measurements were the following:
Housing flange to flange: 55.75"
Drive Axle flange to flange: 60.75"
Perch center to center: 43"
Perch width (lateral) 2.5"

 

[LoveThatHood]

I've been contemplating the same if I can find a 9" that is already geared closer to what I want. Current axle is 8" with 2.75's.