1969 Barracuda 340 Formula S Restoration

Got the axle pulled out and disassembled. Based on what I see so far, It appears that this was the original axle. I checked with Norm VerHage (previous owner) and he said he never made any changes to the axle.
The Housing casting date code is not 100% legible, but according to 65dartcharger on the FABO Suspension section it is J21 or Sept 21st. However, there is no way of knowing what year.
Diff housing and gears.jpg Diff 2.jpg diff 1.jpg

springs.jpg

Diff 3.jpg