Identification of a 7.5" vs. a 8.5" rear axle can be a little difficult if you don't know what to look for.
The 7.5" rear axle can be identified by the "fangs" on the bottom of the center section:
Image courtesy of Paul Baumgartt
While the 8.5" rear axle can be identified by the "triangles" on the bottom of the center section:
Image courtesy of Paul Baumgartt
And a Ford 9" rear can be identified by the lack of a cover on the rear of the housing:
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