What is This?

Casting numbers are not necessarily part numbers.
Lares has a tag with the part number:
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The numbers I came up with on a quick search are 11031 and 11033, which have pitman shaft diameters of 1.25 and 1.12" respectively.
There is also an 11043 box, which is a quick ratio version of the 11033 box (10:1).