Swing axle transmission identification help

[Stonedbeetle]

I am putting together a project based on a 59 pan and I have two swing axle transmissions I can use but am struggling with identification. The two codes are:

AO524 730

and

4 317 390


I can't seem to make sense of any of the charts I am looking at.

Thanks for any clarification you can provide!
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Is it normal that I am still learning about my first bus, and am reading classified ads for other busses?

[Bruce]

67-68

Oct 61
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[Stonedbeetle]

This makes sense Bruce. I was leaning toward a 67 on the first one and the second came out of 62 pan.
_________________
Is it normal that I am still learning about my first bus, and am reading classified ads for other busses?